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insidious

adjective

/ɪnˈsɪdiəs/

Meaning

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

The insidious spread of misinformation can damage trust.

stealthy, subtle, harmful, dangerous, deceitful

harmless, obvious, safe

insidious disease, insidious influence, insidious spread

noisy, energetic, and cheerful; rowdy

Becoming outdated or on the way to becoming obsolete.

having the appearance or characteristics of a tree; tree-like

Related to thinking, understanding, learning, and remembering.

able to be seen, recognized, or understood

Unreasonably high in price or cost; excessive.