sadistically
Concise Oxford English Dictionary © 2008 Oxford University Press:
sadism/ˈseɪdɪzəm/
▶noun the tendency to derive sexual gratification or general pleasure from inflicting pain, suffering, or humiliation on others.
– derivatives
sadist noun,
sadistic adjective,
sadistically adverb.
sadist noun,
sadistic adjective,
sadistically adverb.
– origin C19: from Fr. sadisme, from the name of the 18th-cent. French writer the Marquis de Sade.
'sadistically' also found in these Oxford entries:

