Two words with opposite meanings. Cold and hot are antonyms; so are small and large. (Compare synonyms.)
Words nearby antonyms
How to use antonyms in a sentence
To satisfy this new curiosity of the children we have dictionaries of synonyms and antonyms, and word-charts.
Books of synonyms and antonyms—used cautiously, for there are few perfect synonyms in any language—will be found of great help.
A book of synonyms and antonyms is in preparation for this series, "The Writer's Library."
In the series we have prepared, the verbs are either synonyms or antonyms.
These words which express opposite meaning are called antonyms.Plain English|Marian Wharton