Synonyms|248Antonyms|89|Broader|5Narrower|0Related|187
1
ravenous(adjective, violent, cruel, vicious, fierce)
1
revengeful(adjective, mean, harsh, cruel, vicious)
1
rigorous(adjective, hard, tough, harsh, cruel)
1
rough
1
rude
1
sanguinary(adjective, hard, tough, harsh, violent)
1
shameless(adjective, hard, tough, harsh, cruel)
1
sour(adjective, hard, tough, harsh, cruel)
1
surly(adjective, mean, harsh, cruel, vicious)
1
terrible
1
thick-skinned
1
thoughtless
1
truculent(adjective, violent, cruel, vicious, fierce)
1
tyrannical(adjective, hard, tough, harsh, cruel)
1
tyrannous(adjective, severe, harsh, cruel)
1
unappealing(adjective, coldhearted)
1
unappeasable(adjective, mean, severe, harsh, cruel)
1
unbending
1
uncalled-for(adjective, mean, severe, harsh, cruel)
1
uncompassioned
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ChicagoSmart Define. 2016. "unmerciful thesaurus" https://smartdefine.org/unmerciful/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unmerciful thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unmerciful/thesaurus/synonyms>.
MLASmart Define. "unmerciful thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/unmerciful/thesaurus/synonyms>