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  1. www.collinsdictionary.com › us › dictionaryINSIDIOUS definition in American English | Collins English...

    intended to entrap or beguile. an insidious plan. 2. stealthily treacherous or deceitful. an insidious enemy. 3. operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect. an insidious disease. SYNONYMS 1. corrupting.

  2. dictionary.cambridge.org › dictionary › learner-englishINSIDIOUS | meaning - Cambridge Learner's Dictionary

    INSIDIOUS definition: having harmful effects that happen gradually so you do not notice them for a long time: . Learn more.

  3. www.oxfordlearnersdictionaries.com › insidiousinsidious adjective - Definition, pictures, pronunciation and...

    Definition of insidious adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  4. www.oxfordlearnersdictionaries.com › english › insidiousinsidious adjective - Definition, pictures, pronunciation and...

    spreading gradually or without being noticed, but causing serious harm. the insidious effects of polluted water supplies

  5. dictionary.cambridge.org › insidiousINSIDIOUS in Simplified Chinese - Cambridge Dictionary

    INSIDIOUS translate: 暗中为害的；隐伏的. Learn more in the Cambridge English-Chinese simplified Dictionary.

  6. dictionary.cambridge.org › insidiousINSIDIOUS in Traditional Chinese - Cambridge Dictionary

    INSIDIOUS translate: 暗中為害的；潛伏的. Learn more in the Cambridge English-Chinese traditional Dictionary.

  7. premium-oxforddictionaries-com.libproxy.ucl.ac.ukpremium-oxforddictionaries-com.libproxy.ucl.ac.uk

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