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Daemon
Posted: Friday, January 20, 2017 12:00:00 AM
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insidious

(adjective) Working or spreading harmfully in a subtle or stealthy manner.

Synonyms: pernicious, subtle

Usage: He appeared to be recovering, but the insidious disease soon reappeared in his other organs.
Mehrdad77
Posted: Friday, January 20, 2017 12:22:36 AM

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insidious (adj.)
1540s, from Middle French insidieux "insidious" (15c.) or directly from Latin insidiosus "deceitful, cunning, artful, treacherous," from insidiae (plural) "plot, snare, ambush," from insidere "sit on, occupy," from in- "in" + sedere "to sit". Figurative, usually with a suggestion of lying in wait and the intent to entrap. Related: Insidiously; insidiousness.
Mehrdad77
Posted: Friday, January 20, 2017 12:24:49 AM

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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.
Mehrdad77
Posted: Friday, January 20, 2017 12:25:48 AM

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Insidious is related to the Latin noun, īnsidiae meaning "ambush" which comes from the Latin verb, īnsidēre "to lie in wait for." This is very fitting as an insidious rumor or problem is one whose negative effect is not realized until the damage is already done. Similarly, an insidious disease develops internally without symptoms, so that you don't realize right away that you are sick.
Mehrdad77
Posted: Friday, January 20, 2017 12:29:57 AM

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In a community like the Adams Houses, densely packed and secluded, the crews exert insidious influence.


New York Times Oct 7, 2016
monamagda
Posted: Friday, January 20, 2017 8:37:27 AM

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Neither insidious nor invidious are happy words: insidious describes something that lies in wait to get you, and invidious is something offensive or defamatory. Cancer can be insidious, lurking in your body without your knowing it. Invidious doesn't hide; it's hateful right away.

Insidious didn't fall too far from the tree – it comes directly from the Latin word insidiosus meaning "deceitful, cunning, artful," from insidiae "plot, snare, ambush." Something insidious can even be attractive while doing harm, like an insidious plot to befriend your crush's girlfriend, so you can break them up. But often it's not attractive, just sneaky:

Storms like Agnes and Irene are insidious, often striking slowly over time in ways that can be unpredictable and far more damaging than anticipated. (Salon)

An insidious new email virus infiltrated high-profile US companies Thursday. (Toronto Star)

Rather, it is the insidious silence and insensitivity that surrounds so many of the most excruciating diseases of the mind that so often trigger suicide. (CNN)

https://www.vocabulary.com/articles/chooseyourwords/insidious-invidious/
RAJAT SINGH PARAMAR
Posted: Friday, January 20, 2017 10:20:33 AM

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insidious
adjective
proceeding in a gradual, subtle way, but with very harmful effects.
"sexual harassment is a serious and insidious problem"
synonyms: stealthy, subtle, surreptitious, sneaking, cunning, crafty, Machiavellian, artful, guileful, sly, wily, tricky, slick, deceitful, deceptive, dishonest, underhand, backhanded, indirect; informalsneaky
"the insidious erosion of rights and liberties"
Irma Crespo
Posted: Friday, February 03, 2017 12:16:40 AM

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Adj. 1. insidious - beguiling but harmful; "insidious pleasures"
seductive - tending to entice into a desired action or state
2. insidious - intended to entrap
dangerous, unsafe - involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
3. insidious - working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"
pernicious, subtle
harmful - causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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