/ Thesaurus / N Synonyms of nonfissionable Find synonyms for: Adjective1. nonfissionable (vs. fissionable)usage: not capable of undergoing fissionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: anecdote Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language