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  1. www.oed.com › dictionary › pernicious_adj1pernicious, adj.¹ meanings, etymology and more | Oxford ...

    pernicious, adj.¹ meanings, etymology, pronunciation and more in the Oxford English Dictionary

  2. www.collinsdictionary.com › english › perniciousPERNICIOUS definition in American English | Collins English ...

    SYNONYMY NOTE: pernicious applies to that which does great harm by insidiously undermining or weakening [pernicious anemia, a pernicious dogma]; baneful implies a harming by or as by poisoning [a baneful superstition]; noxious refers to anything that is injurious to physical or mental health [noxious fumes]; deleterious implies slower, less irreparable injury to the health [the deleterious effects of an unbalanced diet]; detrimental implies a causing of damage, loss, or disadvantage to ...

  3. en.wiktionary.org › wiki › perniciouspernicious - Wiktionary, the free dictionary

    Jun 2, 2024 · pernicious ( comparative more pernicious, superlative most pernicious) Causing much harm in a subtle way. Synonyms: deleterious, (obsolete) venom. Causing death or injury; deadly . Synonym: attery. (of a person) Insidiously villainous: intending to cause harm, especially in a subtle way.

  4. www.oxfordlearnersdictionaries.com › definitionpernicious adjective - Definition, pictures, pronunciation ...

    Definition of pernicious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  5. www.merriam-webster.com › thesaurus › perniciousPERNICIOUS Synonyms: 90 Similar and Opposite Words | Merriam ...

    Synonyms for PERNICIOUS: harmful, dangerous, detrimental, damaging, adverse, bad, poisonous, deleterious; Antonyms of PERNICIOUS: benign, harmless, beneficial ...

  6. www.yourdictionary.com › perniciousPernicious Definition & Meaning | YourDictionary

    Pernicious definition: Tending to cause death or serious injury; deadly.

  7. www.britannica.com › dictionary › perniciousPernicious Definition & Meaning | Britannica Dictionary

    Britannica Dictionary definition of PERNICIOUS. [more pernicious; most pernicious] formal. : causing great harm or damage often in a way that is not easily seen or noticed. More pernicious still has been the acceptance of the author's controversial ideas by the general public. the pernicious effects of jealousy.