Breadcrumb Home > Thesaurus > S Synonyms of sidesplitting Find synonyms for: Adjective 1. killing, sidesplitting, humorous (vs. humorless), humourous usage: very funny; "a killing joke"; "sidesplitting antics" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sidesplitting (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: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language