insidious

[in·sid·i·ous]

If something is slowly and secretly causing harm, it's insidious like the rumors no one seems to listen to until suddenly someone's reputation is ruined.

...

Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe.

Adjective S.
working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"

Adjective S.
intended to entrap

Adjective S.
beguiling but harmful; "insidious pleasures"


a.
Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe.

a.
Intended to entrap; characterized by treachery and deceit; as, insidious arts.


Insidious

In*sid"i*ous , a. [L. insidiosus, fr. insidiae an ambush, fr. insidere to sit in; pref. in- + sedere to sit: cf. F. insidieux. See Sit.] 1. Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe. "The insidious witch." Cowper. 2. Intended to entrap; characterized by treachery and deceit; as, insidious arts.
The insidious whisper of the bad angel.
Insidious disease (Med.), a disease existing, without marked symptoms, but ready to become active upon some slight occasion; a disease not appearing to be as bad as it really is. Syn. -- Crafty; wily; artful; sly; designing; guileful; circumventive; treacherous; deceitful; deceptive. -- In*sid"i*ous*ly, adv. -- In*sid"i*ous*ness, n.

Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe.

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Usage Examples

Folks, the most insidious part of this whole health care scheme is that all of these vast medical expenditures will become nothing more than government budget items. We individuals will no longer exist. The relationship between a government and citizen will change forever.

Unfortunately, money in politics is an insidious thing - and a loophole in our campaign finance system was taken advantage of with money going to existing or new 527 groups with the sole purpose of influencing the election.

Misspelled Form

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Other Usage Examples

I am concerned for the security of our great Nation not so much because of any threat from without, but because of the insidious forces working from within.

I think the worst and most insidious procrastination for me is research. I will be looking for some bit of fact or figure to include in the novel, and before I know, I've wasted an entire morning delving into that subject matter without a word written.

I'm equally guilty of using technology - I Twitter, I text people, I chat. But I think there's something strangely insidious about it that it makes us think we're closer when in fact we're not seeing each other, we're not connecting.

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