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Definitions from the Web

Insidious

Part of Speech: Adjective

Definition: Proceeding in a gradual, subtle way, but with harmful effects; deceitful or treacherous.

Example Sentences:

1. His insidious behavior eventually led to the downfall of the company.
2. The insidious disease spread silently throughout the community.
3. The insidious influence of social media can often go unnoticed.

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