14 letters · 19 points in Scrabble
noun result of a fallacy or error in reasoning
originEtymology tree English fallacious Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English fallaciousness From fallacious + -ness.
Etymology from Wiktionary, CC BY-SA 3.0