/ Thesaurus / H Synonyms of harmfulness Find synonyms for: Noun1. harmfulness, injuriousness, destructivenessusage: destructiveness that causes harm or injury2. harmfulness, noisomeness, noxiousness, unwholesomeness, morbidness, morbidityusage: the quality of being noxiousWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language