/ Thesaurus / A Synonyms of addlehead Find synonyms for: Noun1. addle-head, addlehead, loon, birdbrain, misfitusage: a person with confused ideas; incapable of serious thoughtWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language