/ Thesaurus / K Synonyms of know it all Find synonyms for: Noun1. know-it-all, know-all, egotist, egoist, swellheadusage: someone who thinks he knows everything and refuses to accept advice or information from othersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language