Breadcrumb Home > Thesaurus > J Synonyms of jackass Find synonyms for: Noun 1. fathead, goof, goofball, bozo, jackass, goose, cuckoo, twat, zany, fool, sap, saphead, muggins, tomfool usage: a man who is a stupid incompetent fool 2. jack, jackass, ass usage: male donkey WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of jackass (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: voxpopuli Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language