As nouns the difference between unfaithfulness and faithfulness
is that unfaithfulness is the characteristic of being unfaithful; infidelity; disloyalty while faithfulness is the state of being faithful; allegiance; loyalty; fidelity.
unfaithfulness
English
Noun
The characteristic of being unfaithful; infidelity; disloyalty.
faithfulness
English
Noun
(-)
The state of being faithful; allegiance; loyalty; fidelity.