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• a  not true to duty or obligation or promises
  an unfaithful lover
• a  having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
  her husband was unfaithful
• s  having the character of, or characteristic of, a traitor
• s  not trustworthy
  an unfaithful reproduction

• Her husband will no longer be able to be unfaithful with impunity, nor will he be allowed to take his bastard children into the house as if they were legitimate, or repudiate his .
• A whispering campaign was launched suggesting that he was impotent and that Dolley was unfaithful.
• France, now brazenly fascist, must always have been unfaithful to democracy at heart.

• faithless
• traitorous
• treasonable
• treasonous

• faithful

News & Articles

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• Kanye West Cheating Rumors Are 'Totally Without Merit,' Says Rep
  The rapper's publicist tells PEOPLE in a statement that reports West has been unfaithful to Kim Kardashian are "malicious"
  June 12, 2013 - People Magazine
• Woman who photographed alleged cheater: “I just thought he was such a pig”
  The woman who posted an allegedly unfaithful husband's photo on Facebook is "shocked" by the response        
  June 8, 2013 - Salon.com

Quotes

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• Tiger Wood in OnTheRedCarpet.com (blog)
  He apologized publicly about his infidelity to wife in February saying, "I am deeply sorry for my irresponsible and selfish behavior I engaged in," he said. "I was unfaithful. I had affairs. I cheated. What I did is not acceptable and I am...
• Mark Sanford in CBS News
  I've been unfaithful to my wife, and I developed a relationship with what started as a dear, dear friend from Argentina,Gov. Sanford said during a press conference in the state capital of Columbia.
• Kylie Minogue in ic Wales
  But Minogue said, "I have never been unfaithful to a partner and would find it completely immoral to be involved with a married man."