in an insidious manner

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

A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.

(transitive, obsolete) To lie in ambush for.

(obsolete) One who lies in ambush.

plural of insidiator

simple past tense and past participle of insidiate

plural of insidiousness

Third-person singular simple present indicative form of insidiate