3
unmoved(adjective, cold, cruel, unfeeling, unsympathetic)
3
unprincipled(adjective, honest, corrupt, vicious, dishonest)
3
unshakeable(adjective, resolute)
3
valiant(adjective, resolute)
3
wild(adjective, rude, violent, cruel, vicious)
3
willing(adjective, resolute)
3
zealous(adjective, resolute)
2
abominable(adjective, wicked)
2
abusive(adjective, mean, hard, severe, sharp)
2
aggressive(adjective, nasty, violent, cruel, determined)
2
animal(adjective, mean, cruel, vicious, fierce)
2
avenging(adjective, mean, hateful, malicious, spiteful)
2
awful(adjective, wicked)
2
bad(adjective, evil, unpleasant, corrupt, vicious)
2
blunt(adjective, insensitive)
2
brute
2
cannibalistic(adjective, animal, mean, violent, cruel)
2
constant(adjective, resolute)
2
criminal(adjective, wicked)
2
decisive(adjective, resolute)
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APASmart Define. (2016). ruthless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/ruthless/thesaurus/synonyms
ChicagoSmart Define. 2016. "ruthless thesaurus" https://smartdefine.org/ruthless/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, ruthless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/ruthless/thesaurus/synonyms>.
MLASmart Define. "ruthless thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/ruthless/thesaurus/synonyms>