/ Thesaurus / S Synonyms of sitting duck Find synonyms for: Noun1. sitting duck, easy mark, victim, dupeusage: a defenseless victimWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language