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TOEFL BNC: 13916 COCA: 12333

insidious

adjective
/ɪnˈsɪdiəs/
/ɪnˈsɪdiəs/
(formal, disapproving)
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  1. spreading gradually or without being noticed, but causing serious harm潜伏的;隐袭的;隐伏的
    • the insidious effects of polluted water supplies供水系统污染的潜在恶果
    Oxford Collocations DictionaryInsidious is used with these nouns:
    • threat
    See full entry
    Word Originmid 16th cent.: from Latin insidiosus ‘cunning’, from insidiae ‘an ambush or trick’, from insidere ‘lie in wait for’, from in- ‘on’ + sedere ‘sit’.

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