UNFAITHFUL a.
Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithful subject; an unfaithful agent or servant. My feet, through wine, unfaithful to their weight. Pope. His honor rooted in dishonor stood, And faith unfaithful kept him falsely true.…
VIRTUE n.
reception in all the towns." Addison. "This they shall attain, partly in virtue of the promise made by God, and partly in virtue of piety." Atterbury. -- Theological virtues, the three virtues, faith, hope, and charity. See 1 Cor. xiii. 13.
VOW n. 4 definitions
A solemn promise made to God, or to some deity; an act by which one consecrates or devotes himself, absolutely or conditionally, wholly or in part, for a longer or shorter time, to some act, service, or condition; a devotion of one's possessions; as, a baptismal vow; a vow of poverty. "Nothing . . . that may . . . stai…