insidiously


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in·sid·i·ous

 (ĭn-sĭd′ē-əs)
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 īnsidiōsus, from īnsidiae, ambush, from īnsidēre, to sit upon, lie in wait for : in-, in, on; see in-2 + sedēre, to sit; see sed- in Indo-European roots.]

in·sid′i·ous·ly adv.
in·sid′i·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.insidiously - in a harmfully insidious manner; "these drugs act insidiously"
Translations

insidiously

[ɪnˈsɪdɪəslɪ] ADVinsidiosamente

insidiously

[ɪnˈsɪdiəsli] advinsidieusement

insidiously

[ɪnˈsɪdɪəslɪ] advinsidiosamente
References in classic literature ?
Lecount -- returning insidiously, in company with that besetting anxiety to talk about his grievances, which had got the better of him at the breakfast-table, and which had shown the wound inflicted on his vanity to his wife's maid.
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.
Henry Jekyll stood at times aghast before the acts of Edward Hyde; but the situation was apart from ordinary laws, and insidiously relaxed the grasp of conscience.
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.
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.
First came the Chinese immigration (or, rather, it was already there, having come there slowly and insidiously during the previous years).
When I remember the insidiously relaxing effect of it on all my faculties, I feel inclined to alter the popular definition, and to call it a moral vapor-bath.
Let this man be tried by a temptation which insidiously calls into action, in his own interests, the savage instincts latent in humanity--the instincts of self-seeking and cruelty which are at the bottom of all crime.
Shall I ask you whether God is a magician, and of a nature to appear insidiously now in one shape, and now in another--sometimes himself changing and passing into many forms, sometimes deceiving us with the semblance of such transformations; or is he one and the same immutably fixed in his own proper image?
I felt the inexpugnable strength of common sense being insidiously menaced by this gruesome, by this insane, delusion.
It seems that the insidiously inventive techno-wizard Fegan Floop (Alan Cumming) has captured all the world's top spies.
This dark, moody and weird-looking film is intriguing, unsettling and insidiously creepy.