HealthAugust 17, 2026

insidious

in-SID-ee-us

Definition

Proceeding in a gradual, subtle way, but with very harmful or dangerous effects.

Etymology

Derived from the Latin 'insidiosus', meaning 'deceitful' or 'cunning', which comes from 'insidiae' meaning 'an ambush' or 'a snare'.

In the news

Dr. Geller uses this term to describe how sarcomas often lack early symptoms, making them sneaky and difficult to detect until they have already become dangerous.

Mount Vernon mayor shares health journey 2 years after cancer battle

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Lohud

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