Emily Dickinson Lexicon

UN-FAITH'FUL-NESS, n.

Neglect or violation of vows, promises, allegiance, or other duty; breach of confidence or trust reposed; perfidiousness; treachery; as, the unfaithfulness of a subject to his prince or the state; the unfaithfulness of a husband to his wife, or of a wife to her husband; the unfaithfulness of an agent, servant, or officer.