/ Thesaurus / S Synonyms of siss Find synonyms for: Verb1. hiss, sizz, siss, sibilate, talk, speak, utter, mouth, verbalize, verbaliseusage: express or utter with a hiss2. hiss, siss, sizz, sibilate, utter, emit, let out, let looseusage: make a sharp hissing sound, as if to show disapprovalWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language