Nuisible d'une manière lente et cachée.
Harmful in a slow, hidden way.
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See how the word “insidieux” is used in sentences
La maladie a un début insidieux. — The disease has an insidious onset.
L'humidité est insidieuse, et on s'en aperçoit trop tard. — Damp is insidious, and you notice it too late.
La flatterie peut être un moyen insidieux d'obtenir des faveurs. — Flattery can be an insidious way to get favors.
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