Definify.com

Webster 1913 Edition

(pẽr-fĭd′ĭ-ŭs; 277)

Adj.

[L.

perfidious

Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; treacherous; faithless;

as, a

perfidious

friend

Shak.

Involving, or characterized by, perfidy.

“Involved in this perfidious fraud.”

Milton.

Adj.

[L. perfidus; per and fidus, faithful. Per in this word signifies through, beyond, or by, aside.]

Violating good faith or vows; false to trust or confidence reposed; treacherous; as a perfidious agent; a perfidious friend. [See Perfidy.]

Proceeding from treachery, or consisting in breach of faith; as a perfidious act.

Guilty of violated allegiance; as a perfidious citizen; a man perfidious to his country.