cheater

noun

1. the act of deceiving or swindling; deception; fraud
2. a person who defrauds, deceives, or tricks others; swindler
3. chess

transitive verb

1. to deal with dishonestly for one's own gain; defraud; swindle
2. to deceive by trickery; fool; mislead
3. to foil or escape by tricks or by good luck: to cheat death
4. to deprive of or destroy the effect of through error or ignorance: using the wrong word cheated him of his legacy

intransitive verb

1. to practice fraud or deception
2. to behave dishonestly, as at games or on an examination
3. ☆ Informal to be sexually unfaithful: often with on