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   insidious

   /ɪnˈsɪdɪəs/

   adjective

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

   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

   • I

     1

   • N

     1

   • S

     1

   • I

     1

   • D

     2

   • I

     1

   • O

     1

   • U

     1

   • S

     1

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