not faithful to a spouse or lover; "adulterous husbands and wives"; "a two-timing boyfriend"[syn: adulterous ]

violating accepted standards or rules; "a dirty fighter"; "used foul means to gain power"; "a nasty unsporting serve"; "fined for unsportsmanlike behavior"

a deception for profit to yourself[syn: cheat ]

noun

defrauding , deceiving , deception , dishonesty , chicanery , duplicity