Webster's English Dictionary

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unfaithful

un.faith.ful \-'fa-th-f*l\ \-f*-le-\ aj : not faithful :  : not adhering to 
   vows, allegiance, or duty : DISLOYAL  : not faithful to marriage vows  
   archaic  : wanting in good faith : DISHONEST  : INACCURATE, UNTRUSTWORTHY  
   - un.faith.ful.ly av