115 entries under tough topic. ×

46
cruel(adjective, appearance, mean, hard)
42
ruthless(adjective, appearance, mean, hard)
37
pitiless(adjective, mean, hard, kind)
30
unmerciful(adjective, mean, hard, kind)
29
brutal(adjective, mean, hard, severe)
27
heartless(adjective, mean, feeling, hard)
24
savage(adjective, mean, hard, rough)
24
uncompassionate(adjective, person, mean, hard)
24
unkind(adjective, person, mean, hard)
23
harsh(adjective, mean, hard, severe)
23
inhuman(adjective, animal, mean, hard)
22
unsympathetic(adjective, person, mean, hard)
21
callous(adjective, person, mean, hard)
21
hard(adjective, mean, severe, evil)
20
inhumane(adjective, mean, hard, severe)
18
barbarous(adjective, appearance, mean, hard)
18
unforgiving(adjective, person, mean, hard)
18
unrelenting(adjective, appearance, mean, hard)
17
hard-hearted(adjective, mean, hard, severe)
15
stony(adjective, person, mean, hard)
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APASmart Define. (2016). merciless thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/merciless/thesaurus/synonyms
ChicagoSmart Define. 2016. "merciless thesaurus" https://smartdefine.org/merciless/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, merciless thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/merciless/thesaurus/synonyms>.
MLASmart Define. "merciless thesaurus" 31 March 2016. Web. 30 September 2026. <https://smartdefine.org/merciless/thesaurus/synonyms>