Bible Dictionaries
Insidious

Webster's Dictionary

(1):

(a.) Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; - said of persons; as, the insidious foe.

(2):

(a.) Intended to entrap; characterized by treachery and deceit; as, insidious arts.

Bibliography Information
Webster, Noah. Entry for 'Insidious'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​i/insidious.html. 1828.