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

   dictionary.cambridge.org › us › dictionary

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   adjective. us / ɪnˈsɪd·i·əs / Add to word list. (of something unpleasant or dangerous) gradually and secretly causing harm: Cancer is an insidious disease. insidiously. adverb us / ɪnˈsɪd·i·əs·li / His negative attitude slowly and insidiously spoiled the atmosphere around the office.

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

   www.vocabulary.com › dictionary › insidious

   Definitions of insidious. adjective. working or spreading in a hidden and usually injurious way. “glaucoma is an insidious disease” synonyms: pernicious, subtle. harmful. causing or capable of causing harm. adjective. intended to entrap. synonyms: dangerous, unsafe. involving or causing danger or risk; liable to hurt or harm. adjective.

4. www.oxfordlearnersdictionaries.com › us › definitioninsidious adjective - Definition, pictures, pronunciation and ...

   www.oxfordlearnersdictionaries.com › us › definition

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

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

   www.collinsdictionary.com › dictionary › english

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   2 days ago · Something that is insidious is unpleasant or dangerous and develops gradually without being noticed . The changes are insidious, and will not produce a noticeable effect for 15 to 20 years. They focus on overt discrimination rather than insidious aspects of racism. Synonyms: stealthy, subtle, cunning, designing More Synonyms of insidious.

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

   www.collinsdictionary.com › us › dictionary

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   5 days ago · 1. 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.

7. premium-oxforddictionaries-com.libproxy.ucl.ac.ukinsidious - definition of insidious in English from the ...

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

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   adjective. proceeding in a gradual, subtle way, but with very harmful effects: sexual harassment is a serious and insidious problem. More example sentences Synonyms. Derivatives. insidiousness. Pronunciation: /ɪnˈsɪdɪəsnəs/ noun. Example sentences. Origin.

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

   dictionary.cambridge.org › dictionary › learner-english

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