Synonyms of demoniac in English:

demoniac

(also demoniacal)

See US English definition of demoniac

See UK English 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