UNFA'ITHFULNESS, noun 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.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.