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  1. Dictionary
    insidious
    /ɪnˈsɪdɪəs/

    adjective

    • 1. proceeding in a gradual, subtle way, but with very harmful effects: "sexual harassment is a serious and insidious problem"

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

    INSIDIOUS definition: 1. (of something unpleasant or dangerous) gradually and secretly causing harm: 2. (of something…. Learn more.

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

    The meaning of INSIDIOUS is having a gradual and cumulative effect : subtle. How to use insidious in a sentence. insidious, sinister, or pernicious?

  4. www.dictionary.com › browse › insidiousINSIDIOUS Definition & Meaning | Dictionary.com

    The word insidious is used to describe something as being stealthy, treacherous, or operating in the shadows, as in He came up with an insidious plan to rob the jewelry store. Insidious is always associated with something negative, implying something is bad or is going to cause harm.

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

    INSIDIOUS meaning: 1. (of something unpleasant or dangerous) gradually and secretly causing harm: 2. (of something…. Learn more.

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

    Something that is insidious is unpleasant or dangerous and develops gradually without being noticed.

  7. www.vocabulary.com › dictionary › insidiousInsidious - Definition, Meaning & Synonyms | Vocabulary.com

    If something is slowly and secretly causing harm, it's insidious — like the rumors no one seems to listen to until suddenly someone's reputation is ruined. Insidious is related to the Latin noun, īnsidiae meaning "ambush" which comes from the Latin verb, īnsidēre "to lie in wait for."

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

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