/ Dictionary / Index U ungrammatical: Meaning and Definition of Find definitions for: un•gram•mat•i•cal Pronunciation: (un"gru-mat'i-kul), [key] — adj. grammatically incorrect or awkward; not conforming to the rules or principles of grammar or accepted usage: an ungrammatical sentence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ungrammatical (Thesaurus) ungracious ungrateful Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language