/ Thesaurus / T Synonyms of tranquilliser Find synonyms for: Noun1. tranquilizer, tranquillizer, tranquilliser, antianxiety agent, ataractic drug, ataractic agent, ataractic, psychotropic agent, sedative-hypnotic, sedative-hypnotic drugusage: a drug used to reduce stress or tension without reducing mental clarityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language