Origin of insidious
Examples from the Web for insidiously
Others, more quietly but just as insidiously, operate from the Muslim religious right.
There was a muggy warmth in it which relaxed their muscles and insidiously slackened the domination of their will.Long Odds|Harold Bindloss
That is the cocher's special mission in life—subtly and insidiously to humiliate the tourist.A Wanderer in Paris|E. V. Lucas
Yet, it is insidiously objected, their craziness or their possessedness is at least their sin.The Ego and His Own|Max Stirner
Because it nailed him to environment that insidiously sapped his manhood, along with his mental and manual skill.Criminal Types|V. M. Masten
A tendency to undermine the best interests of the art is, however, insidiously at work to misguide the public taste.
British Dictionary definitions for insidiously
Word Origin for insidious
Word Origin and History for insidiously
1540s, from Middle French insidieux (15c.) or directly from Latin insidiosus "deceitful, cunning, artful," from insidiae (plural) "plot, snare, ambush," from insidere "sit on, occupy," from in- "in" (see in- (2)) + sedere "to sit" (see sedentary). Related: Insidiously; insidiousness.