insidiously

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Definitions from WordNet

Adverbial insidiously has 1 sense

insidiously, perniciously - in a harmfully insidious manner; "these drugs act insidiously"
Derived from adjective insidious₃

Definitions from the Web

Insidiously

Part of Speech: Adverb

Definition: In a subtle or gradual manner that is intended to deceive or harm.

Sense 1: Characterized by stealth or treachery.

Example sentences:

He insidiously plotted to undermine his colleague's reputation.
The disease spreads insidiously, often without noticeable symptoms.
The insidiously changing weather made it difficult to plan outdoor activities.

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