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insidiously

   Also found in: Medical 0.07 sec.
in·sid·i·ous  (n-sd-s)
adj.
1. Working or spreading harmfully in a subtle or stealthy manner: insidious rumors; an insidious disease.
2. Intended to entrap; treacherous: insidious misinformation.
3. Beguiling but harmful; alluring: insidious pleasures.
[From Latin nsidisus, from nsidiae, ambush, from nsidre, to sit upon, lie in wait for : in-, in, on; see in-2 + sedre, to sit; see sed- in Indo-European roots.]
in·sidi·ous·ly adv.
in·sidi·ous·ness n.
ThesaurusLegend:  Synonyms Related Words Antonyms
Adv.1.insidiously - in a harmfully insidious manner; "these drugs act insidiously"
perniciously
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? Mentioned in ? References in classic literature
 
They are intended for the perusal of young women, at that tender age when the feelings of their nature begin to act on them most insidiously, and when their minds are least prepared by reason and experience to contend with their passions.
Imagination and Heart by Cooper, James Fenimore View in context
Attempts so extravagant as these to disfigure or, it might rather be said, to metamorphose the object, render it necessary to take an accurate view of its real nature and form: in order as well to ascertain its true aspect and genuine appearance, as to unmask the disingenuity and expose the fallacy of the counterfeit resemblances which have been so insidiously, as well as industriously, propagated.
Federalist Papers Authored by Alexander Hamilton by Hamilton, Alexander View in context
From some sense of this, and of the dizzy see-saw - heaven-high, hell-deep - on which men sit clutching; or perhaps fearing that the sources of his fortune might be insidiously traced to some root in the field of petty cash; he stuck to his work, said not a word of his new circumstances, and kept his account with a bank in a different quarter of the town.
Tales and Fantasies by Stevenson, Robert Louis View in context
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