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Hidden HarmPlay
Use 'insidious' for problems that worsen without obvious symptoms. SlideThe spy's insidious sabotage went unnoticed until it was too late.
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Slow ProgressionPlay
Describes something harmful developing gradually, which may be difficult to detect initially. SlideClimate change is an insidious threat that evolves over decades.
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Cultural NuancePlay
'Insidious' is often used to describe sly tactics or conspiracies in movies and literature. SlideThe insidious plot of the villain in the novel kept readers on edge.