misconduct

1 improper or illegal behavior some rough play got the hockey player fined for misconduct on the ice Synonyms malfeasance, misbehavior, misdoing, wrongdoing Related Words crime, malefaction, misdeed, misdemeanor, sin, transgression, trespass, wrong; malpractice; goings-on, hanky-panky; familiarity, gaffe, impropriety, indiscretion; blunder, error, fault, flub, fumble, goof, lapse, miscue, misstep, mistake, slip, slipup, stumble

2 a sexual encounter or relationship between a married person and someone other than their spouse both parties cited misconduct as the reason for the divorce Synonyms cheating, infidelity, adultery, two-timing, unfaithfulnessRelated Words criminal conversation; free love, promiscuity; disloyalty, faithlessness, falseness, inconstancy, perfidiousness, perfidy, treachery; affair (also affaire), amour, fling, love, love affair, romance; intrigue; attachment, infatuation; entanglement, flirtation; liaison, passionNear Antonyms allegiance, constancy, dedication, devotedness, devotion, fealty, loyalty, steadfastnessAntonyms faithfulness, fidelity