Synonyms|586Antonyms|160|Broader|8Narrower|7Related|599
2
tigerish(adjective, violent, cruel, vicious, fierce)
2
uncivilised
2
unsentimental
2
unstoppable(adjective, harsh, cruel, determined, fierce)
2
untamed(adjective, rough, violent, cruel, vicious)
2
unwarmhearted(adjective, person, negative)
2
virulent(adjective, evil, nasty, harsh, vicious)
2
wayward(adjective, wicked, senseless, unwarranted, reckless)
2
wicked(adjective, evil, nasty, harsh, corrupt)
2
without mercy(expression, adjective, vicious, fierce)
1
Draconian
1
Machiavellian(adjective, wicked)
1
abominable(adjective, wicked)
1
accidentally on purpose(expression, adjective, idiom, senseless, unwarranted)
1
affectless
1
afflictive(adjective, unpleasant, vicious, painful, distressing)
1
amoral(adjective, wicked)
1
anesthetized(adjective, hard, tough, severe, cold)
1
arduous(adjective, tough, severe, rough, difficult)
1
asleep(adjective, hard, tough, severe, cold)
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ChicagoSmart Define. 2016. "merciless thesaurus" https://smartdefine.org/merciless/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, merciless thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/merciless/thesaurus/synonyms>.
MLASmart Define. "merciless thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/merciless/thesaurus/synonyms>