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Definitions from the Web

Term: insidious

Part of Speech: Adjective

Sense 1:

Definition: Proceeding in a gradual, subtle way, but with harmful effects.

Sample Sentence: The insidious effects of air pollution can be detrimental to both human health and the environment.

Related Products: Air Purifier

Sense 2:

Definition: Intended to entrap or deceive.

Sample Sentence: The seductive allure of the insidious sales tactics persuaded many vulnerable individuals into purchasing unnecessary items.

Related Products: Self-defense Pepper Spray

Part of Speech: Adverb

Sense 1:

Definition: In an insidious manner; with harmful intent.

Sample Sentence: The enemy slowly and insidiously infiltrated the organization, causing chaos from within.

Related Products: Spy Camera