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  1. Dictionary
    pernicious
    /pəˈnɪʃəs/

    adjective

    • 1. having a harmful effect, especially in a gradual or subtle way: "the pernicious influences of the mass media"

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  2. dictionary.cambridge.org › dictionary › englishPERNICIOUS | English meaning - Cambridge Dictionary

    having a very harmful effect or influence: The cuts in government funding have had a pernicious effect on local health services. SMART Vocabulary: related words and phrases. Dangerous and harmful. adverse conditions. adverse effect. adverse publicity. adverse reaction. deleteriously. destabilizing. destructively. destructiveness. inimically.

  3. www.merriam-webster.com › dictionary › perniciousPernicious Definition & Meaning - Merriam-Webster

    Pernicious means highly injurious or destructive, or wicked. Learn its synonyms, examples, etymology, and related words from the Merriam-Webster dictionary.

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  5. dictionary.cambridge.org › us › dictionaryPERNICIOUS | definition in the Cambridge English Dictionary

    having a very harmful effect or influence: The cuts in government funding have had a pernicious effect on local health services. SMART Vocabulary: related words and phrases. Dangerous and harmful. adverse conditions. adverse effect. adverse publicity. adverse reaction. deleteriously. destabilizing. destructively. destructiveness. impact statement.

  6. www.collinsdictionary.com › dictionary › englishPERNICIOUS definition and meaning | Collins English Dictionary

    Pernicious means very harmful or causing great injury, ruin, or death. It can also mean wicked or evil, but this sense is rare and often outdated. See synonyms, examples, and word origin of pernicious.

  7. www.dictionary.com › browse › perniciousPERNICIOUS Definition & Meaning | Dictionary.com

    Pernicious definition: causing insidious harm or ruin; ruinous; injurious; hurtful. See examples of PERNICIOUS used in a sentence.

  8. www.vocabulary.com › dictionary › perniciousPernicious - Definition, Meaning & Synonyms | Vocabulary.com

    Pernicious means harmful and subtle, such as a poison gas that causes illness in those exposed to it over the course of years.

  9. www.oxfordlearnersdictionaries.com › english › perniciouspernicious adjective - Definition, pictures, pronunciation and...

    Pernicious means having a very harmful effect on somebody/something, especially in a way that is not easily noticed. Learn how to use this formal adjective with pictures, pronunciation and usage notes.