Dictionary


in•sid•i•ous



Pronunciation: (in-sid'ē-us), [key]
—adj.
1. intended to entrap or beguile: an insidious plan.
2. stealthily treacherous or deceitful: an insidious enemy.
3. operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect: an insidious disease.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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