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  1. PERNICIOUS definition: 1. having a very harmful effect or influence: 2. having a very harmful effect or influence: 3…. Learn more.

  2. Learn the meaning, synonyms, and usage of the word pernicious, which means highly injurious or destructive, or wicked. See examples of pernicious in sentences and related phrases and articles.

  3. Add to word list. 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. adverse conditions. adverse effect.

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

  5. Learn the meaning of pernicious, an adjective that describes something very harmful or deadly. Find out the origin, pronunciation, and usage of pernicious in sentences and collocations.

  6. pernicious. adjective. formal uk / pəˈnɪʃəs / us. Add to word list. Add to word list. very harmful. (Definition of pernicious from the Cambridge Learner's Dictionary © Cambridge University Press)

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

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