Here’s a psychopathy checklist. It’s not Hare’s Psychopathy Checklist, which is a bit more definitive, but it shows you some common traits of psychopaths. DON’T use it for self-diagnosis!
Impervious to fear, anxiety, depression, or remorse
(unremorseful)
Superficially charming, a real cool cat
(manipulative and conning)
Inability to love or express emotions deeply, can’t respond to kindness (cold)
Pathological lying
(for no reason at all, can’t help self)
No self-insight
(doesn’t reflect much upon own personality makeup)
No self-humor
(can’t stand to be the butt of jokes or can’t laugh at self)
A fairly high IQ
(good grades in school or disparity in achievement)
Uses neologisms
(makes up strange new words, abbreviations, or sayings)
Fascination with fire
(or death, or purified ways to destroy something)
Cruelty to animals
(or doesn’t like animals)
Lack of probity, courtesy, or doesn’t tolerate society’s “niceties” or obligations
Moody, obsessive-compulsive, suffers from one or more phobias
Does not tend to learn from mistakes unless immediate punishment given
Lack of formal-operational thinking
(tends to think in concrete, black-or-white terms)
Identity conflict
(often with delayed adolescence, hasn’t grown up in certain ways)
Preconventional morality
(thinks things are wrong only because it might lead to punishment or it’s not in his/her best interests right now, failure to understand disparities between own behavior and socially acceptable behavior, often in trouble with law)
From: http://faculty.ncwc.edu/toconnor/301/psycpath.htm
And here’s a nice link which summarizes psychopathy:
http://faculty.ncwc.edu/toconnor/428/428lect16.htm