faithlessness

He understood that the agony of loss which was hers was far greater even than the agony which her faithlessness had meant for him.

A certain human faithlessness often interferes with the execution of such plans.

He resented the compulsion which was put upon him by the ingratitude and faithlessness of the Corinthians.

Domitius indeed, as if he were repenting after the discovery of his faithlessness and treachery, died immediately.

He hears of cases of faithlessness on the part of other persons; every circumstance seems to confirm him in his belief.