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Definitions

insidious

[in-sid-ee-uhs] / ɪnˈsɪd i əs /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That’s why the Rededicate 250 event is so insidious — even if the speakers behave themselves and don’t say anything too controversial on stage.

From Salon • May 15, 2026

"They are insidious; they will do what they want, and it will not save us, in any case," added the 71-year-old, who was displaced by fighting in eastern Ukraine.

From Barron's • Apr. 30, 2026

Can psychoanalysis make sense of our most insidious urges?

From The Wall Street Journal • Apr. 8, 2026

It’s a subtle shift where “treat yourself” moments — like frequent dinners out or luxury upgrades — slowly morph into consistent, insidious monthly expenses.

From MarketWatch • Apr. 7, 2026

And so Gaylyn was left wondering whether Reggie was sincerely traumatized by the accident, and therefore couldn’t remember what had happened, or whether there was something more insidious occurring.

From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel




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