Breadcrumb Home > Thesaurus > K Synonyms of killjoy Find synonyms for: Noun 1. spoilsport, killjoy, wet blanket, party pooper, unwelcome person, persona non grata usage: someone who spoils the pleasure of others WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of killjoy (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language