Synonyms of demoniac in English:

demoniac

(also demoniacal)

See definition of demoniac

adjective

1‘he has demoniac powers’

SYNONYMS
devilish, demonic, diabolic, diabolical, fiendish, satanic, Mephistophelian, hellish, infernal, evil, wicked, ungodly, unholy
rare cacodemonic
ANTONYMS

angelic