Synonyms for Satanic:

adj.

demonic (adjective)
devilish, diabolical, Fiendish, wicked, vicious, infernal, diabolic, cruel, evil, hellish.
diabolical (adjective)
Fiendish.
evil (adjective)
demonic, sinister.
impious (adjective)
unholy.
satanic (adjective)
demonic, Fiendish, devilish, diabolic.
wicked (adjective)
devilish.

n.

cruel, awful, hateful, pitiless, unkind, uncharitable, monstrous, inhuman, hard. horn, black mass, old nick, the devil, lucifer, kind, the forces of darkness/evil, ghoulish, Satanical, satanism, Ogreish. malicious (noun)
vicious, sinister.
satanic (noun)
diabolic, demonic, evil, unholy, Fiendish, wicked, infernal, hellish, diabolical.

Other synonyms:

lucifer, satanism, ghoulish, Ogreish, old nick, black mass, Satanical. horn. vicious
cruel.
Other relevant words:
satanism, Satanical, hateful, awful, lucifer, infernal, monstrous, unholy, vicious, cruel, hellish, diabolical, horn, unkind, Ogreish, evil, pitiless, hard, wicked, sinister, uncharitable, kind, inhuman, ghoulish.

Usage examples for satanic

  1. Corbario, satisfied with the immediate effect of his satanic speech, waited a moment, sighed, looked down at his cigar, and then went on in gentle tones. – Whosoever Shall Offend by F. Marion Crawford
  2. Just as you'd know his satanic majesty, if he should appear to you?" – Tempest and Sunshine by Mary J. Holmes
  3. Possibly he might be attempting to keep us there so that Fuller could get up to some satanic trick elsewhere. – The Mystery of the Green Ray by William Le Queux