Breadcrumb Home > Thesaurus > U Synonyms of ungrammatical Find synonyms for: Adjective 1. ungrammatical (vs. grammatical), ill-formed, incorrect usage: not grammatical; not conforming to the rules of grammar or accepted usage WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ungrammatical (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: supererogatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language