Without belief in the revealed truths of religion; unbelieving. O faithless generation. Matthew 17:17.

Not believing; not giving credit to.

Not adhering to allegiance or duty; disloyal; perfidious; treacherous; as a faithless subject.

Not true to a master or employer; neglectful; as a faithless servant.

Not true to the marriage covenant; false; as a faithless husband or wife.

Not observant of promises.

Deceptive. Yonder faithless phantom.