unfaithful

Part of speech: adverb

Unfaithfully.

Part of speech: adjective

Perfidious; faithless.

Part of speech: adjective

Not true to a standard.

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Usage examples "unfaithful":

  1. An unfaithful treatment will only make the evil worse, the burden heavier. - "The Indian Question (1874)", Francis A. Walker.
  2. I understand now the novels about unfaithful wives, and all that kind of thing. - "Will Warburton", George Gissing.
  3. For her sake, I am unfaithful to them, I enter her chamber at night by the window, which I climb up to when all are asleep. - "French and Oriental Love in a Harem", Mario Uchard.