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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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Derived Forms

  • ˈ徱dzܲԱ, noun
  • ˈ徱dzܲ, adverb
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Other yvlog Forms

  • ·i·dzܲ· adverb
  • ·i·dzܲ·Ա noun
  • ܲi·i·dzܲ adjective
  • un·i·dzܲ· adverb
  • un·i·dzܲ·Ա noun
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yvlog 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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yvlog 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.

At his core, Hitler despised Marxism, viewing it as an insidious Jewish conspiracy.

From

An insidious but lesser-known consequence of even a mild measles infection is that it kills the very cells that remember which pathogens the patient has previously fought and how those battles were won.

From

With women underrepresented in front of and behind the camera, male storytellers often shaped '90s narratives about women in insidious ways.

From

To Didion, Kennedy represented something insidious in the American character: the desire for voters to admire politicians like movie stars, and the pandering of American politicians to provide heroes made of clay.

From

What makes use of the device so insidious is not simply the monitoring, of course, but that trivial actions, and even non-actions, mere thoughts, lead inexorably to nightmarish scenarios.

From

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More About Insidious

What does insidious 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.

Where does insidious come from?

The first records of insidious come from around 1535. It comes from the Latin Բ徱ōܲ, meaning “deceitful.”

The word insidious is often used in the media and popular culture to describe conspiracies, schemes, corruption, shadowy organizations, and other bad things that are done in secret.

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What are some other forms related to insidious?

  • insidiously (adjective)
  • insidiousness (noun)

What are some synonyms for insidious?

What are some words that often get used in discussing insidious?

How is Բ徱dzܲused in real life?

Insidious is a word that describes something as being sneaky and up to no good.

Try using insidious!

Is insidious used correctly in the following sentence?

She was so cunning and crafty that we didn’t have a clue about her insidious plans until after she had betrayed us.

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