WordReference Random House Learner's Dictionary of American English © 2025
an•to•nym /ˈæntənɪm/USA pronunciation   n. [countable]
  1. a word opposite in meaning to another: Fast is an antonym of slow.Compare synonym (def. 1).
an•ton•y•mous /ænˈtɑnəməs/USA pronunciation  adj. See -onym-.

WordReference Random House Unabridged Dictionary of American English © 2025
an•to•nym  (an′tə nim),USA pronunciation n. 
  1. a word opposite in meaning to another. Fast is an antonym of slow. Cf. synonym (def. 1).
  • 1865–70; ant- + (syn)onym
an•ton•y•mous  (an ton′ə məs),USA pronunciation an′to•nym′ic, adj.  an•ton′y•my, n. 

'antonymous' also found in these entries (note: many are not synonyms or translations):
antonym

Forum discussions with the word(s) "antonymous" in the title:


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