List of self-contradicting words in English

This is a list of self-contradicting English words -- that is, words which in and of themselves have two or more generally accepted meanings in the English language that directly or generally contradict each other. Such words are also known as auto-antonyms, antagonyms, contronyms, and words having contradefinitions. Many such contradefinitions arise from slang usage. Others develop as a result of their frequent use in sarcasm.
A similar concept, where a commonly used phrase contains two words which have or can be construed to have definitions in opposition to each other is known as an oxymoron. See list of oxymorons for a list of examples.
There are two forms of contranyms: homographic, where two words with the same spelling can have opposing definitions; and homophonic, where two words with the same pronunciation can have opposing definitions. In general, the terms below are both homographic and homophonic contranyms.
Richard Lederer included a list of self-contradicting words in a chapter on Janus-faced words in his book Crazy English.
T-Rex in the November 2nd, 2007 edition of Dinosaur Comics describes this class of words as homographic homophonic autantonyms.
A
; Adumbrate : (1) to disclose (2) to obscure
; Anabasis : (1) a military advance (2) a difficult and dangerous military retreat
; Apology : (1) an admission of error accompanied by a plea for forgiveness (2) a formal defense or justification
; Awesome : (1) expressive of awe (2) inspiring awe
; Against : (1) in the direction of and into contact with ("against the wall") (2) in a direction opposite to ("against the wind")
B
; Before : (1) in advance of ("the future is before us") (2) at an earlier time, previously ("our forefathers came before us")
; Blunt : (2) object with an edge or point that is dull or not sharp (2) a direct, abrupt, sharp, to the point manner or speech
; Bolt : (1) (transitive verb) to secure something in place (with a bolt) (2) (intransitive verb) to leave or quickly run away from
; Boned : To contain bones, to remove bones, or be in the state of having had bones removed.
; Bound : In the construction bound for, it means "moving towards someplace"; as an adjective by itself, it means "tied up, secure", in other words "unable to move".
; Buckle : As a verb construction of the noun buckle, which is a device for clasping a belt together, it means "to secure, tighten, hold"; otherwise, it means "to weaken, collapse".
C
; Certain : can refer either to an indeterminate quality ("she has a certain air about her") as well as to an established fact (a certainty).
; Check (cheque) : Like bill, this can either refer to a bank check, having a positive monetary value; or (in US English) to a restaurant check, which is a statement of money owed.
; Chuffed : In British slang this has come to mean "pleased", synonymous to "puffed up"; the strict definition is "displeased, upset".
; Cleave : To cleave means both to separate and to cling together.
; Clip : When referring to the noun clip, this verb means "to attach together". Otherwise, as applied to part of a larger corpus (e.g. "clipping an article"), it means "to cut apart from".
; Commencement : As a noun form of the verb commence, this should mean "the start"; however the most popular use of the term is for university graduation ceremonies, at the end of schooling. (It should be noted that the intent of the term is to mean "the start of professional life", but this is not the primary perception of the event.)
; Comprise : means "to consist of" (The nation comprises fifty states) but is also commonly used to mean "to constitute" (Fifty states comprise the nation).
; Constrain : can mean both "to force to" and "to repress".
; Consume: "consume calories" can mean either "eat calories" or "burn calories". It all depends what you're focusing on as the energy reservoir (the food, or the fat cells in the body).
; Contingent : The adjective contingent describes a known dependency or result; but the noun form contingency usually refers to an unexpected event.
; Continue : The verb continue means "to keep doing"; however the noun form continuation, in legal usage, means "to pick up later", particularly in the form continuance.
; Cool : In commonly accepted slang, cool means happy, pleasant, agreeable; but when referring to a personal interaction, especially in politics, it usually means "less than agreeable" or "polite but strained" (he received a cool reception to his speech).
; Cover: Can mean to conceal, as in "cover up;" or to expose, as in covering a news story; also to keep in sight, monitor, or maintain awareness of an opponent's position and/or actions (military and sports usages).
; Critical : Can mean "vital to success" (a critical component), or "disparaging" (a critical comment).
; Custom : As a noun, this means "conventional behavior"; but as an adjective, it means "specially designed".
D
; Derivation : Derivation means both "something derived; a derivative" and the "source from which something is derived; an origin."
; Discursive : In essay structure, it can mean either to be rambling or freeform (American usage), but also can mean to be strictly structured (British usage).
; Dispose : As a past tense verb, disposed means "removed" or "gotten rid of"; as an adjective; disposed means "available".
; Downhill : When referring to difficulty, it means "progressively easier"; but when referring to status or condition, it means "progressively worse".
; Dusting : When dusting furniture, this means "to remove dust from"; but when "dusting for fingerprints", or when used as a noun ("a dusting of snow"), it means respectively "to apply dust" or "the application of dust".
E
; Either : As an adjective, it can mean "one or the other of two," as in "you either passed or failed your test". It can also mean "each of two; the one and the other" as in "there are trees on either side of the river."
; Enduring : Can mean either "long lasting" or "suffering through". In some context this can lead to antonymic word play, as Noam Chomsky pointed out in connection with George W. Bush's name for the war in Afghanistan: "Enduring Freedom".
; Enjoin : A verb meaning either "to require" or "to forbid," as in a judicial order
; Execute : To execute a person is to end their life; to execute a program is to start it [Note: This contradiction arises from a shift in meaning of execution in the sense of capital punishment; what is being executed is technically the sentence of death (i.e. it is being started, just like starting a program), but the usage has shifted away from the sentence and to the prisoner].
F
; Fast : Fast can mean either "to move or do quickly" or it can mean "to not move," as in "holding fast". As an adjective, it can also convey both meanings: "The rabbit is fast;" "The door is fast."
; Fix : Fix can mean either "to mend" or it can mean "to break," as in "I'll fix you".
; Flank : Flank can either mean to protect the sides of something or to attack the flanks.
G
; Garnish : With food, the verb means "to add to"; with wages, it means "to take from". (Strictly speaking, though, the intention of the latter is to mean something added to the charges against the wages, alongside insurance, taxes, etc.)
; Generally : usually true, but also subject to exception. The meaning "all-inclusive, without exception" is now obsolete.
H
; Handicap : Advantage (e.g. in sport) or disadvantage/disability
; Hardly: Either barely just, or with extreme power
; Hew : "To separate" as well as "to stick (to)" (when used with "to"); cf. "cleave" above.
I
; Incomparable : The most common meaning of this adjective is "eminent beyond comparison, matchless": something is incomparable if it is far greater than anything else in its class. However, in mathematics, two objects are incomparable if neither is greater than the other.
J
K
L
; Lease : To lend or to borrow.
; Left : As a past tense verb, it means "to have gone"; as an adjective; it means "remaining".
; Let : As a verb usually means "allow"; in an older (but not obsolete) sense it means "prevent".
; Lurid : Can mean either pale or glowing with color.
M
; Moot : Formerly and more acceptably meaning "open for discussion, debatable," it is now more commonly used to mean "irrelevant to discussion or debate."
; Mosey : it can mean to move quickly or to move leisurely
N
O
; Off : Generally, something being off means it is not operating; however when an alarm goes off, it means it has started operating (or when a person goes off, it means they have become very agitated).
; Original : Original either means plain, or unchanged (as in original flavour), or it could mean something creative or new (an original idea).
; Out : Similar to off, to take something out means to remove it; but to bring something out is to exhibit it prominently. For instance saying that "the lights are out" means they are not shining, but saying 'the stars are out" means they are easily visible.
; Outstanding : Exceptional, prominent, excellent; but also unsettled, unresolved, overdue.
; Oversight : When used as a general concept, this word is the noun form of oversee, which means "to manage and be in charge of". But when used to refer to a specific incident, it becomes the noun form of overlook, meaning "error" or lapse in proper management.
P
; Peer : Strictly, a peer is someone on the same social level as you; but in chiefly British usage, a peer is a person having a title of nobility (and so at a higher social level than the general populace).
; Peruse : Although considered an error by most usage experts, the word peruse is commonly understood to mean "to skim over" or "to glance at." The accepted definition is "to examine closely."
; Pitch : To discard. Also, to promote. A headline from the washingtonpost.com edition of January 6, 2009, reading "Obama Pitches Stimulus Plan" is ambiguous, though the "promote" meaning is intended.
; Presently : Its older meaning is "immediately"; its contemporary meaning is "in a while".
; Prove : Originally, this meant "test", but the meaning now includes "verify". It is the original meaning that is intended in such phrases as "50 proof", "the proof is in the pudding", and "the exception proves the rule".
; Public : As a noun, it refers to the common people of a society; however as an adjective, it normally refers to things operated by the government. (Of course, such government operations are maintained for public use. Furthermore, under representative democracy, the people and the government are considered one and the same by definition.)
Q
; Qualified : Can mean "limited" (as in "qualified success") or "skilled, skilful" (as in "a qualified expert").
; Quiddity : Can mean either the essence of a thing or a quibble.
; Quite: Can mean either "somewhat", or "utterly".
R
; Radical : can mean fundamental or departure from the usual
; Raveling: means both to entangle and to untangle
; Reflexive: can mean "marked by reflection" or "characterized by habitual, unthinking behavior"
; Rent : can be used to mean paying to use something, as in "I'm renting an apartment", or used to mean taking money to let someone else something of yours, as in "We rent cars to anyone, no questions asked"
; Reservation : as a concrete noun, this can be "a confirmation" of availability; as an abstract noun, it is "a fear or uncertainty".
; Resign : when someone resigns a contract (transitive) he commits to continuing his involvement in some activity. On the other hand, when he resigns (intransitive) he relieves himself of that commitment. The former is sometimes hyphenated (i.e. re-sign) to emphasize its pronunciation and differentiate the pair. For example, to resign from work is to end the work, while to resign oneself to work is to give up all hope of ending the work.
; Riot : A riot is usually a chaotic spree of violence and destruction; but in more casual use it can refer to a funny story or a good party. (Outside observers may argue that this last definition often resembles the first.)
S
; Sanction : The verb sanction means "to permit"; the noun sanctions normally means "restrictions".
; Scan : Originally, this word meant "to examine closely," but has come to mean "to look over hastily".
; Screen : Conceal with or as if with a screen; or "to display prominently" as in screening a film.
; Secreted : Usually obvious due to context; but this can mean either "hidden" (secreted away), or "exposed" (secreted from a wound). The former is the verb form of "secret", and is pronounced with the emphasis on the first syllable. The latter is the past tense of "secrete" and is pronounced with the emphasis on the second syllable.
; Seed : to plant a field, or to clean seeds from a fruit
; Several : Originally meaning "separate, single, or individual", (as in "the several states" referred to in the US Constitution) it is now understood to mean "plural, more than two".
; Shelled : Shelled can describe either the result of removing a shell (e.g., we shelled the hazelnuts) or describe something that has a shell (e.g., turtles are like shelled snakes with legs).
; Show-stopper : In the standard usage, this means "something that is strikingly attractive or has great popular appeal". Recent usage particularly in the computer industry has "A bug that makes an implementation effectively unusable".
; Sick : Used with a standard definition, this word can mean "disgusted; revolted," but used colloquially, it can mean "very pleasant; agreeable".
; Sinople : A color word that can mean either green or red, depending on usage.
; Skin : To add skin, or to remove it. "Skin that deer" "Skin that kayak".
; Smell : Means both to emit an odor ("My foot smells") and to perceive an odor ("My nose smells"). The former is a rare example of the use of ergativity in English , which occurs when what is typically a direct object of a transitive verb is re-processed as an intransitive verb — "My foot smells" is in essence a re-processing of " smells my foot."
; Stakeholder : Historically and legally means to hold (but not have an interest in) a stake; however, the term is now sometimes used, especially re corporate governance, to reference one who does have an interest in an issue.
; Stay : Can mean stopping an action ("stay the execution"), or to continue an action ("stay the course" - note: the original meaning of the phrase "stay the course" was in the first sense; that is, to stop the course of action).
; Strike : Normally meaning "to hit", in baseball it means "to miss", and an extension of this usage has led to the meaning "to make a mistake". Further adding to the contradiction, in bowling it refers to the best possible play. Another contradiction results with the phrase strike out: the baseball lineage leads to the meaning "to run out of hope"; but the original lineage also leads to the meaning "to start pursuing a desire"
; Suspicious : Can mean that a person is acting in a way that suggests wrong-doing, i.e. "He seems very suspicious." or can mean that the person in question suspects wrong doing in others, i.e. "He was suspicious of her motives."
T
; Table : Generally, the phrase put on the table means "to present something for consideration"; however, in American parliamentary procedure, the verb table means to put off discussion of a topic.
; Temper : As a verb, it can either mean to soften or mollify, or to strengthen (e.g. a metal).
; Terrific : Originally and still used to mean "inducing terror", but has now come to have a positive connotation as well, meaning "fantastic" or "amazing"
; Trim : Similar to clip: it can mean "to add decoration to" (trim the (Christmas) tree), or "to remove from" (trim the bushes).
; Trying : As an adjective, 'hard to endure'. As a verb, 'to make an effort'. A teacher's report may say, "Your child is trying".
U
; Unbending : Rigid, inflexible, refusing to yield or compromise, as in "his stance against reform was unbending": or becoming less tense, relaxing, as in "unbending a little, she confided ..."
; Unshelled : Not removed from their shells (adjective) or having been removed from their shells (the past tense and past participle of "to unshell"). The ambiguity therefore arises when in the adjective is used predicatively, as in "The eggs were unshelled", which can mean "The eggs had not been removed from their shells" or "The eggs were removed from their shells" (someone unshelled them).
; Utopia : A system of government regarded as perfect, often without war, poverty, hunger and the like, as in "It would be great if we could live in a utopia" : or a system of government bound to fall into a dystopia due to imperfect humans, or carelessness in design, or other factors, as in "His idea is naively utopian!"
V
W
; Weather : Weathering a storm means "to endure" the storm; but generally weathering means "to decay".
; Wicked : Similar to awesome above, the strict definition of the adjective is "evil"; the now generally accepted slang usage (barring regional quirks) is roughly equivalent to "very good".
X
Z

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