sa·dism 
(sādĭz′əm, sădĭz′-)
(sādĭz′əm, sădĭz′-)n.
1. The deriving of sexual gratification from fantasies or acts that involve causing others to suffer physical or mental pain. Also called sexual sadism.
2. The deriving of pleasure from cruelty.
3. Extreme cruelty: video games that are full of sadism.
[After ComteDonatien Alphonse François de Sade.]
sadist n.
sa·distic (sə-dĭstĭk) adj.
sa·disti·cal·ly adv.