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WordReference Random House Learner's Dictionary of American English © 2024in•sid•i•ous /ɪnˈsɪdiəs/USA pronunciation adj. - treacherous;
sneaky and dishonest:an insidious plan. - operating or proceeding without being noticed but with serious effect:an insidious disease.
See -sid-. WordReference Random House Unabridged Dictionary of American English © 2024in•sid•i•ous (in sid′ē əs),USA pronunciation adj. - intended to entrap or beguile:an insidious plan.
- stealthily treacherous or deceitful:an insidious enemy.
- operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect:an insidious disease.
- Latin insidiōsus deceitful, equivalent. to insidi(ae) (plural) an ambush (derivative of insidēre to sit in or on) + -ōsus -ous
- 1535–45
- 1.See corresponding entry in Unabridged corrupting.
- 2.See corresponding entry in Unabridged artful, cunning, wily, subtle, crafty.
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