01 a. Not believing; not giving credit.
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1.
Not believing; not giving credit.“Be not faithless, but believing.” — John xx. 27.
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2.
Not believing on God or religion; specifically, not believing in the Christian religion.
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3.
Not observant of promises or covenants.
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4.
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.” — Shak.
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5.
Serving to disappoint or deceive; delusive; unsatisfying.