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Insidious

usgb/ɪnˈsɪdiəs/Volume
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Hidden Harm

Use 'insidious' for problems that worsen without obvious symptoms.

Illustration for Hidden Harm
The spy's insidious sabotage went unnoticed until it was too late.
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Slow Progression

Describes something harmful developing gradually, which may be difficult to detect initially.

Illustration for Slow Progression
Climate change is an insidious threat that evolves over decades.
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Cultural Nuance

'Insidious' is often used to describe sly tactics or conspiracies in movies and literature.

Illustration for Cultural Nuance
The insidious plot of the villain in the novel kept readers on edge.
Visual representation of the word "Insidious"

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