possible profanity
6
cold-blooded(adjective, person, mean, cruel, vicious)
6
corrupt
6
fell(adjective, animal, mean, cruel, vicious)
6
malign(adjective, animal, mean, violent, wild)
6
unholy(adjective, wicked)
6
unwarmhearted(noun, adjective, person, evil, cruel)
5
hateful(adjective, animal, person, mean, violent)
5
maleficent
5
aloof(adjective, person, unwarmhearted)
5
antagonistic(adjective, person, unwarmhearted)
5
awful(adjective, wicked)
5
banemalenteous(adjective, person, unwarmhearted)
5
cool(adjective, person, unwarmhearted)
5
damnable(adjective, evil, vile, wicked, irritating)
5
frigid(adjective, person, unwarmhearted)
5
glacial(adjective, person, unwarmhearted)
5
half-spirited(adjective, person, unwarmhearted)
5
hard(adjective, person, unwarmhearted)
5
horrible
5
icy(adjective, person, unwarmhearted)
10 years ago|18k views|share |citing 
APASmart Define. (2016). fiendish thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fiendish/thesaurus/synonyms
ChicagoSmart Define. 2016. "fiendish thesaurus" https://smartdefine.org/fiendish/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, fiendish thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fiendish/thesaurus/synonyms>.
MLASmart Define. "fiendish thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/fiendish/thesaurus/synonyms>