/ Thesaurus / A Synonyms of ad infinitum Find synonyms for: Adverb1. ad infinitumusage: to infinity; without or seemingly without limit; "talked on and on ad infinitum"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language