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1. Not faithful to a spouse or lover
   - adulterous, two-timing
    
2. Violating accepted standards or rules
   - dirty, foul, unsporting, unsportsmanlike

1. A deception for profit to yourself
   - cheat

1. Deprive somebody of something by deceit
   "we were cheated by their clever-sounding scheme"
   - rip off, chisel
    
2. Defeat someone through trickery or deceit
   - chouse, shaft, screw, chicane, jockey
    
3. Engage in deceitful behaviour; practice trickery or fraud
   - chisel
    
4. Be sexually unfaithful to one's partner in marriage
   "She cheats on her husband"
   - cheat on, cuckold, betray, wander

See also: cheater, unfair, unfaithful, unjust

Type of: beat, beat out, cozen, crush, deceit, deceive, deception, delude, dissembling, dissimulation, lead on, shell, trounce, vanquish, victimise [Brit], victimize

Encyclopedia: Cheat