10 letters · 15 points in Scrabble
adjective of words: having opposite meanings
originEtymology tree English antonym Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ōtsos or *-otsos Latin -ōsus Old French -usbor. Middle English -ous English -ous English antonymous From antonym + -ous.
Etymology from Wiktionary, CC BY-SA 3.0