/ Thesaurus / X Synonyms of xxxiii Find synonyms for: Adjective1. thirty-three, 33, xxxiii, cardinal (vs. ordinal)usage: being three more than thirtyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: beseech Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language