"wrong, incorrect, unfaithful" is Неверный in Russian.
Неверный means "wrong, incorrect, unfaithful" in English.
Listen to the pronunciationWord #3332 of 4,000 by frequency in Russian — level B2.
Он оказался неверным мужем и разрушил семью.
He turned out to be an unfaithful husband and destroyed the family.