- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
possible profanity
| demoniac(adjective, unusual, wonderful, marvelous, wicked) | |
| savage(adjective, animal, mean, evil, violent) | |
| barbarous(adjective, animal, mean, evil, nasty) | |
| iniquitous(adjective, bad, wrong, evil, violent) | |
| dreadful(adjective, wicked) | |
| monstrous(adjective, wicked, shocking, unnatural) | |
| ruthless(adjective, animal, mean, nasty, cruel) | |
| ghoulish(adjective, kind, hideous, scary) | |
| grim(adjective, animal, person, mean, dark) | |
| heinous(adjective, wicked) | |
| inhumane(adjective, animal, person, mean, cruel) | |
| mean(adjective, animal, person, bad, wrong) | |
| villainous(adjective, bad, wrong, evil, nasty) | |
| beastly(adjective, evil, awful, terrible, rotten) | |
| demoniacal(adjective, evil, malevolence, demon, vice) | |
| hardhearted(adjective, person, pitiless, bad behavior, unwarmhearted) | |
| Mephistophelian(adjective, evil, vile, wicked, demonic) | |
| bloodthirsty(adjective, pitiless, aroused negative) | |
| brutish(adjective, evil, violent, wild, fierce) | |
| cat-hearted(adjective, person, bad behavior, unwarmhearted, aroused negative) |
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| APA | Smart Define. (2016). fiendish thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fiendish/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fiendish thesaurus" https://smartdefine.org/fiendish/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, fiendish thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fiendish/thesaurus/synonyms>. |
| MLA | Smart Define. "fiendish thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/fiendish/thesaurus/synonyms> |