/ Thesaurus / U Synonyms of ungrateful person Find synonyms for: Noun1. ingrate, thankless wretch, ungrateful person, unwelcome person, persona non gratausage: a person who shows no gratitudeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language