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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.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.

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

   www.collinsdictionary.com › dictionary › english

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   3 days ago · insidious in British English. (ɪnˈsɪdɪəs ) adjective. 1. stealthy, subtle, cunning, or treacherous. 2. working in a subtle or apparently innocuous way, but nevertheless deadly. an insidious illness. Collins English Dictionary.

5. 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.

6. 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.

7. www.yourdictionary.com › insidiousInsidious Definition & Meaning | YourDictionary

   www.yourdictionary.com › insidious

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   Insidious Definition. ĭn-sĭdē-əs. Meanings. Synonyms. Sentences. Definition Source. Origin. Adjective. Filter. adjective. Characterized by treachery or slyness; crafty; wily. Webster's New World. Working harm in a slow or subtle manner; hence, more dangerous than seems evident. An insidious disease. Webster's New World. Similar definitions.

8. premium-oxforddictionaries-com.libproxy.ucl.ac.uk › definition › englishinsidious - definition of insidious in English from the Oxford...

   premium-oxforddictionaries-com.libproxy.ucl.ac.uk › definition › english

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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.