perniciousUK:**UK and possibly other pronunciationsUK and possibly other pronunciations/pərˈnɪʃəs/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/pɚˈnɪʃəs/ ,USA pronunciation: respelling(pər nish′əs) pernicious WordReference English Thesaurus © 2026 Synonyms: harmful Collocations, deleterious, detrimental Collocations, noxious Collocations, baneful, damaging, prejudicial, ruinous, destructive, insidious, hurtful, malignant, deadly Collocations, fatal, lethal, poisonous Collocations, venomous, unwholesome, corrosive, malign 🗣️Recent forum discussions about thesaurus entries: fruitful as well as pernicious - English Only forum
harmful / pernicious - English Only forum His psychosis was caused by that most pernicious of drugs... - English Only forum it’s pernicious - English Only forum Just as pernicious is the creeping dysfunction that - English Only forum pernicious enterprise - English Only forum pernicious function - English Only forum pernicious side to the ledger - English Only forum so grudging and pernicious in its effects as to be hardly realized - English Only forum
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