n. 无信
不贞

[ noun ]
unfaithfulness by virtue of being unreliable or treacherous
<noun.attribute>

Faithless \Faith"less\, a.
1. Not believing; not giving credit.

Be not faithless, but believing. --John xx. 27.

2. Not believing on God or religion; specifically, not
believing in the Christian religion. --Shak.

3. Not observant of promises or covenants.

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.

5. Serving to disappoint or deceive; delusive; unsatisfying.
``Yonder faithless phantom.'' --Goldsmith. --
{Faith"less*ly}, adv.{Faith"less*ness}, n.