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View synonyms for

insidious

[in-sid-ee-uhs]

adjective

  1. intended to entrap or beguile.

    an insidious plan.

  2. stealthily treacherous or deceitful.

    an insidious enemy.

    Synonyms: , , , ,
  3. operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect.

    an insidious disease.



insidious

/ ɪˈɪɪə /

adjective

  1. stealthy, subtle, cunning, or treacherous

  2. working in a subtle or apparently innocuous way, but nevertheless deadly

    an insidious illness

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Other Word Forms

  • insidiously adverb
  • insidiousness noun
  • uninsidious adjective
  • uninsidiously adverb
  • uninsidiousness noun
  • ˈ徱dzܲԱ noun
  • ˈ徱dzܲ adverb
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Word History and Origins

Origin of insidious1

First recorded in 1535–45; from Latin Բ徱ōܲ “deceitful,” from insidi(ae) (plural) “an ambush” (from Բŧ “to sit in”) + -ōܲ -ous; sit 1
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Word History and Origins

Origin of insidious1

C16: from Latin Բ徱ōܲ cunning, from insidiae an ambush, from Բŧ to sit in; see insessorial
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Example Sentences

Examples have not been reviewed.

"It gave us a language to describe what was going on in that home, to describe the insidious nature that is mostly non-physical violence," he said.

From

Our bodies have experienced an insidious decline over the past half a century.

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The really insidious thing about our culture and about this moment is that it’s scary and it’s dangerous and it’s catastrophic and it’s absurd and ridiculous and stupid and impossible to take seriously.

From

Compounding current AI control mechanisms is an insidious deprivation: the denial of sensory input.

From

The public is too distracted by the hateful rhetoric and showmanship to notice more insidious actions, such as laws against mass protests and attacks on federal judges.

From

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When To Use

doesinsidious mean?

Insidious describes something as being sneaky or being secretly dangerous or harmful.Insidious also describes something as being corrupting or intending to entrap.The word insidious is used to describe something as being stealthy, treacherous, or operating in the shadows, as in He came up with an insidious plan to rob the jewelry store. Insidious is always associated with something negative, implying something is bad or is going to cause harm.Insidious is also often used to describe something as appearing harmless or nonthreatening but subtly causing serious damage, as in The insidious language in the book radicalized many readers without them even knowing it.Related to this sense, insidious is used in medicine to refer to diseases that slowly get worse and worse without any noticeable signs that they are there at all. Cancer is often described as insidious because it is often found when it is too late to treat it.Example: The investigators were after an insidious group of hackers who were stealing government secrets.

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