English Dictionary

insidious

/ɪnˈsɪdi.əs/

adj

Producing harm in a stealthy, often gradual, manner. / Intending to entrap; alluring but harmful. / (nonstandard) Treacherous.

The insidious virus spread silently throughout the community.

意味（1）

Producing harm in a stealthy, often gradual, manner.

Strong and vigorous man as he looks, Livingstone has been for years the victim of a secret and insidious disease.

意味（2）

Intending to entrap; alluring but harmful.

Gashford slid his cold insidious palm into his master's grasp, and so, hand in hand, and followed still by Barnaby and by his mother too, they mingled with the concourse.

意味（3）

(nonstandard) Treacherous.

But with whom do you contract that alliance? With the natural enemy of France — that insidious house of Austria — which detests our country from feeling, system, and necessity.