a word opposite in meaning to another. Fast is an antonym of slow.: Compare synonym (def. 1).
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- an·ton·y·mous [an-ton-uh-muhs], /ænˈtɒn ə məs/, an·to·nym·ic, adjective
- an·ton·y·my, noun
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How to use antonym in a sentence
Software began decades ago as an unserious programmers’ antonym of “hardware.”From ‘Scientist’ to ‘Spam,’ the Surprisingly Playful Origins of English Words | Ralph Keyes | April 1, 2021 | Time
But, oddly enough, the eyes were a total and surprising antonym of this smiling mouth.The Red Debt | Everett MacDonald
In strict usage, daily is the antonym of nightly as diurnal is of nocturnal.
By and by, which was once a synonym, has become an antonym of immediately, meaning at some (perhaps remote) future time.
Logically the other side of white is not white, while the antonym is the extreme black.Public Speaking | Clarence Stratton
The direct antonym of cause is effect, while that of antecedent is consequent.
British Dictionary definitions for antonym
a word that means the opposite of another word: ``empty'' is an antonym of ``full''
- antonymous (ænˈtɒnɪməs), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012