/ Thesaurus / T Synonyms of toneless Find synonyms for: Adjective1. toneless (vs. toned)usage: lacking in tone or expression; "his toneless mechanical voice"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language