Psychopathy

Usually confused with Psychosis, (insanity) it doesn't actually mean "insane" at all. Traits of Psychopathy include but perhaps are not limited to:
-Lack of Empathy-
-Superficial Charm-
-Irresponsibility-
-Shallow Emotions-
-Impulsivity-
-Grandiose Sense of Worth-

Psychopathy is a psychological condition characterized by antisocial behavior, lack of remorse, empathy, and being bold.

The dog had angered him, so Tyler responded by beating it remorselessly.