Noun
unfaithfulness (countable and uncountable, plural unfaithfulnesses)
The characteristic of being unfaithful; infidelity; disloyalty.
Unfaithfulness in the keeping of an appointment is an act of clear dishonesty. You may as well borrow a person's money as his time. Horace Mann
When a man must force himself to be faithful in his love, this is hardly better than unfaithfulness. François de La Rochefoucauld
In an age when the fashion is to be in love with yourself, confessing to be in love with somebody else is an admission of unfaithfulness to one's beloved. Russell Baker
When a promise is broken, the promise still remains. In one way or another, we are all unfaithful to each other, and physical unfaithfulness is not the worst kind there is. Madeleine L'Engle
Ecclesiasticism in science is only unfaithfulness to truth. Thomas Henry Huxley
We must hold to a rigid accountability those public servants who show unfaithfulness to the interests of the nation or inability to rise to the high level of the new demands. Theodore Roosevelt