105 entries under fierce topic. ×

20
violent(adjective, strong, hard, tough, severe)
19
relentless(adjective, characteristic, appearance, mean, strong)
18
fell(verb, adjective, strong, kind, severe)
17
heinous(adjective, evil, unpleasant, awful, violent)
17
sadistic(adjective, adverb, characteristic, mean, nasty)
16
remorseless(adjective, mean, severe, harsh, violent)
16
unrelenting(adjective, characteristic, appearance, mean, strong)
15
bad(adjective, awful, terrible, wicked, horrible)
15
unyielding(adjective, characteristic, appearance, mean, strong)
14
implacable(adjective, characteristic, appearance, mean, strong)
14
vindictive(adjective, characteristic, person, mean, severe)
13
demoniac(adjective, characteristic, evil, nasty, harsh)
13
horrid(adjective, appearance, mean, nasty, unpleasant)
13
insensitive(adjective, person, mean, hard, cool)
12
unforgiving(adjective, mean, hard, severe, rough)
11
feral(adjective, adverb, mean, strong, kind)
11
sanguinary(adjective, hard, tough, harsh, violent)
11
sinful(adjective, characteristic, evil, nasty, pain)
10
barbarian(adjective, rough, rude, violent, vicious)
10
depraved(adjective, adverb, characteristic, evil, nasty)
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APASmart Define. (2016). cruel thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/cruel/thesaurus/synonyms
ChicagoSmart Define. 2016. "cruel thesaurus" https://smartdefine.org/cruel/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, cruel thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/cruel/thesaurus/synonyms>.
MLASmart Define. "cruel thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/cruel/thesaurus/synonyms>