/ Thesaurus / S Synonyms of silliness Find synonyms for: Noun1. absurdity, fatuity, fatuousness, silliness, folly, foolishness, unwisenessusage: a ludicrous folly; "the crowd laughed at the absurdity of the clown's behavior"2. giddiness, silliness, frivolity, frivolousnessusage: an impulsive scatterbrained mannerWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language