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1. Dictionary

   In·sid·i·ous

   /inˈsidēəs/

   

   adjective

   • 1. proceeding in a gradual, subtle way, but with harmful effects: "sexually transmitted diseases can be insidious and sometimes without symptoms"
   • ▪ treacherous; crafty: "tangible proof of an insidious alliance"

   Word Origin mid 16th century: from Latin insidiosus ‘cunning’, from insidiae ‘an ambush or trick’, from insidere ‘lie in wait for’, from in- ‘on’ + sedere ‘sit’.

   Derivatives

   • 1. insidiousness noun

   Scrabble Points: 10

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

   www.merriam-webster.com › dictionary › insidious

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

3. dictionary.cambridge.org › english › insidiousINSIDIOUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › english › insidious

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

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

   www.dictionary.com › browse › insidious

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

   www.vocabulary.com › dictionary › insidious

   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.

6. dictionary.cambridge.org › english › insidiousINSIDIOUS | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › english › insidious

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

7. www.collinsdictionary.com › english › insidiousINSIDIOUS definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › english › insidious

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   6 days ago · Something that is insidious is unpleasant or dangerous and develops gradually without being noticed.

8. www.thefreedictionary.com › insidiousInsidious - definition of insidious by The Free Dictionary

   www.thefreedictionary.com › insidious

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   1. Working or spreading harmfully in a subtle or stealthy manner: insidious rumors; an insidious disease. 2. Intended to entrap; treacherous: insidious misinformation. 3. Beguiling but harmful; alluring: insidious pleasures.