Insidious
adjective
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.
Could also mean seductive,artful and ingenious. Ex: clever in adapting means to ends. Depends on the context,of course. Always try to find the light amongst the darkness!
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