English dictionary pernicious meaning and definition Definition and meaning of pernicious at MeaningMonkey.org. pernicious meaning and definition in the English Dictionary. PERNICIOUS adjectiveDefinition of pernicious (adjective)exceedingly harmfulsynonyms: baneful, deadly, pestilentworking or spreading in a hidden and usually injurious way"glaucoma is an insidious disease"; "a subtle poison"synonyms: insidious, subtle Source: Princeton University Wordnet
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