6
amok
6
brutal(adjective, evil, nasty, harsh, violent)
6
evil(adjective, nasty, harsh, vicious, vile)
6
ghoulish(adjective, extraordinary, unreasonable, inappropriate, absurd)
6
lunatic(noun, adjective, person, mad, insane)
6
savage(adjective, passionate, violent, cruel, crazy)
5
amuck
5
barbaric(adjective, pitiless)
5
impious(adjective, evil, vile, crazed, devilish)
5
merciless(adjective, evil, nasty, harsh, violent)
5
ungodly(adjective, extraordinary, unreasonable, inappropriate, absurd)
4
cacodemonic
4
crazy(adjective, passionate, cruel, vicious, brutal)
4
damnable(adjective, evil, vile, wicked, execrable)
4
frenzied(adjective, evil, crazed, devilish, infernal)
4
heinous(adjective, vile, devilish)
4
inhumane(adjective, evil, nasty, harsh, violent)
4
iniquitous(adjective, wicked, execrable, demonic, diabolical)
4
maniac(noun, mad, lamebrain, schizophrenic, madman)
4
maniacal(adjective, evil, cruel, vicious, brutal)
11 years ago|5.3k views|share |citing 
APASmart Define. (2015). demoniac thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/demoniac/thesaurus/synonyms
ChicagoSmart Define. 2015. "demoniac thesaurus" https://smartdefine.org/demoniac/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, demoniac thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/demoniac/thesaurus/synonyms>.
MLASmart Define. "demoniac thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/demoniac/thesaurus/synonyms>