Breadcrumb Home > Thesaurus > P Synonyms of pernicious Find synonyms for: Adjective 1. baneful, deadly, pernicious, pestilent, noxious (vs. innocuous) usage: exceedingly harmful 2. insidious, pernicious, subtle, harmful (vs. harmless) usage: working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of pernicious (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language