She is an impulsive and reckless adventurer. He has a reckless and impulsive nature. This helps to decrease the impulsive suicidal behavior. He is impatient, impulsive and self-absorbed. Several animal studies note the role of serotonergic functioning in impulsive aggression and antisocial behavior. Dangerous and impulsive behavior are also correlated with the disorder. Rex is overconfident, impulsive, and typically, rebellious. This often leads to an impulsive and aggressive reaction. There are studies suggesting that citalopram can be useful in reducing aggressive and impulsive behavior. Aggressive behavior has traditionally been classified into two distinct subtypes, impulsive or premeditated. Josephine also disliked Charles for being impulsive, economically irresponsible and morally loose. She is a carefree, impulsive and nature-loving child. She summed the character up as emotionally driven, impulsive, and fun. This contrasts with behavior that is random, impulsive, conditioned, or adopted by (unevaluative) imitation. He is therefore amnesic, inconsequential, impulsive and callous.