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Definitions from the Web

Insidious

Definition: Deceitful or treacherous in a subtle or gradual way

Part of Speech: Adjective

Sense 1: Proceeding in a gradual and harmful way

Example sentence: The insidious disease went undetected until it reached an advanced stage.

Sense 2: Operating or spreading harmfully in a secretive way

Example sentence: The insidious cult had members infiltrated in various organizations.

Sense 3: Attractive or appealing in a way that may cause harm

Example sentence: The insidious trap disguised as a gift lured unsuspecting victims.

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