/ Thesaurus / 3 Synonyms of 30 Find synonyms for: Noun1. thirty, 30, XXX, large integerusage: the cardinal number that is the product of ten and threeAdjective1. thirty, 30, xxx, cardinal (vs. ordinal)usage: being ten more than twentyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language