[suh-dis-tik, sey-, sa-]
pertaining to or characterized by sadism; deriving pleasure or sexual gratification from extreme cruelty: a sadistic psychopath.
Origin of sadistic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
1892, after German sadistisch; see sadism. Related: Sadistically.
Online Etymology Dictionary, © 2010 Douglas Harper