Behavior :: Behavior (n.) Manner of behaving, whether good or bad; mode of conducting one's self; conduct; deportment; carriage; -- used also of inanimate objects; as, the behavior of a ship in a storm; the behavior of the magnetic needle..
Misbehave :: Misbehave (v. t. & i.) To behave ill; to conduct one's self improperly; -- often used with a reciprocal pronoun.