/ Thesaurus / I Synonyms of ill formed Find synonyms for: Adjective1. ungrammatical (vs. grammatical), ill-formed, incorrectusage: not grammatical; not conforming to the rules of grammar or accepted usageWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language