Impassive – definition: showing no sign of emotion or feeling
Impassiveness is a great way to portray a villain. I found a great link, which is worth visiting:
What characteristics have you used in creating a villain?
My character, William in The Twesome Loop, revolted his young wife with his mannerisms but also indulged his sadistic tendencies. His lack of empathy with his victims made him a hated character, which of course was my intent.
Related Links: http://www.wikihow.com/Create-a-Credible-Villain-in-Fiction
Absorbing Your Villain? (mstarksauthor.wordpress.com)