/ Thesaurus / C Synonyms of crestless wave Find synonyms for: Noun1. swell, crestless wave, wave, moving ridgeusage: the undulating movement of the surface of the open seaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language