September 04, 2026

Insidious

adjective

Definition

Proceeding in a gradual, subtle way but with harmful effects. An insidious disease is one that advances quietly until it is too late to stop.

Example Sentence

“The insidious spread of misinformation can undermine entire communities over time.”

Etymology

From Latin insidiosus (cunning, deceitful), from insidiae (ambush), from insidere (to lie in wait).

Scrabble Score

I1N1S1I1D2I1O1U1S1

INSIDIOUS scores 10 points in Scrabble.

Synonyms & Related Words

subtle stealthy treacherous pernicious

Use It in Word Games

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