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1. (adj.) insidious
intended to entrap or beguile:
an insidious plan.
2. insidious
stealthily treacherous or deceitful:
an insidious enemy.
3. insidious
operating or proceeding inconspicuously but with grave effect:
an insidious disease.
Etymology: (1535–45; < L insidiōsus deceitful, der. of insidi(ae) (pl.) an ambush, der. of insidēre to sit in or on)
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| Definition of 'insidious' |
Princeton's WordNet |
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1. (adj) insidious
beguiling but harmful
"insidious pleasures"
2. (adj) insidious
intended to entrap
3. (adj) insidious, pernicious, subtle
working or spreading in a hidden and usually injurious way
"glaucoma is an insidious disease"; "a subtle poison"
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| Definition of 'insidious' |
Webster Dictionary |
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1. (adj) insidious
lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe
2. (adj) insidious
intended to entrap; characterized by treachery and deceit; as, insidious arts
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Definitions of insidious 
