Not believing; not giving credit.
Be not faithless, but believing.
John xx. 27.
Not believing on God or religion; specifically, not believing in the Christian religion.
Not observant of promises or covenants.
Not true to allegiance, duty, or vows; perfidious; trecherous; disloyal; not of true fidelity; inconstant, as a husband or a wife.
A most unnatural and faithless service.
Serving to disappoint or deceive; delusive; unsatisfying.
-- Faith"less*ly, adv.Faith"less*ness, n.
© Webster 1913.