Expand Your Vocabulary: Insidious

in-sid-i-ous [in-sid-ee-uhs]
–ADJECTIVE

*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

*lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous


synonyms: corrupting, artful, cunning, wily, subtle, crafty.