Unfaithful, disloyal; dishonest, false; faithless. Also as n.: a false or dishonest person; (with the) false or dishonest people as a class. Cf. leal…

That does not possess or exhibit good faith, insincere; not faithful to one's promises, friends, spouse, etc.; perfidious, disloyal. Also with to.

Unfaithful to the obligations of friendship or honour, to the marriage tie, etc. (Common in early use: now somewhat rare.)

Disloyal.

Disloyal.

Not loyal; unloyal, disloyal.

Characterized by disaffection (disaffection, n. I.); disaffected; hostile or lacking allegiance to (or towards) an authority, etc. rare.