Antonyms

a word opposite in meaning to another. fast is an antonym of slow.
compare (def 1).
historical examples

antonyms: irregularity, inconstancy, unshapeliness, disorder.
putnam’s word book louis a. flemming

in the series we have prepared, the verbs are either synonyms or antonyms.
montessori elementary materials maria montessori

antonyms: un-btainable, unprocurable, unattainable, inaccessible.
putnam’s word book louis a. flemming

in many instances, however, a list of antonyms is unnecessary.
putnam’s word book louis a. flemming

antonyms: acquiescence, non-resistance, concurrence, agreement.
putnam’s word book louis a. flemming

antonyms: disconnection, detachment, isolation, incoherence.
putnam’s word book louis a. flemming

antonyms: unamenable, unaccountable, disobedient, insubmissive.
putnam’s word book louis a. flemming

antonyms: indistinction, indiscrimination promiscuity, obscurity.
putnam’s word book louis a. flemming

antonyms: inharmonious, discordant, antagonistic, incompatible.
putnam’s word book louis a. flemming

antonyms: unknowable, unascertainable, incognoscible, unrecognizable.
putnam’s word book louis a. flemming

noun
a word that means the opposite of another word: “empty” is an antonym of “full”
n.

1867, coined to serve as opposite of synonym, from greek anti- “equal to, instead of, opposite” (see anti-) + -onym “name” (see name (n.)). perhaps introduced to english in the book “synonyms and antonyms” (1867) by the ven. c.j. smith, m.a.

under the head of synonyms and antonyms, archdeacon smith arranges words which form an ant-thesis to one another. the word “antonym” is, we believe, a new formation but useful. [“journal of sacred literature,” july 1867]

french antonyme (1842), german antonym (by 1859) are older. the un-greek alternative counterterm has been left to fade.

antonyms [(an-tuh-nimz)]

two words with opposite meanings. cold and hot are antonyms; so are small and large. (compare synonyms.)