124 entries under mean topic. ×

11
pitiless(adjective, animal, hard, tough)
10
iron(adjective, strong, hard, tough)
9
obstinate(adjective, hard, cruel, determined)
8
firm(adjective, strong, hard, tough)
8
inhuman(adjective, animal, hard, tough)
8
mortal(adjective, severe, harsh, cruel)
8
vindictive(adjective, hard, tough, severe)
7
dogged(adjective, appearance, hard, tough)
7
immovable(adjective, strong, hard, tough)
7
stiff-necked(adjective, strong, hard, tough)
7
unfeeling(adjective, animal, hard, severe)
6
revengeful(adjective, evil, nasty, harsh)
6
savage(adjective, animal, hard, tough)
6
severe(adjective, appearance, strong, hard)
6
tough(adjective, strong, hard, firm)
6
unflinching(adjective, severe, harsh, cruel)
6
unmerciful(adjective, hard, tough, severe)
5
ferocious(adjective, animal, evil, nasty)
5
stony(adjective, hard, harsh, cold)
5
unsympathetic(adjective, animal, hard, severe)
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APASmart Define. (2016). implacable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/implacable/thesaurus/synonyms
ChicagoSmart Define. 2016. "implacable thesaurus" https://smartdefine.org/implacable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, implacable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/implacable/thesaurus/synonyms>.
MLASmart Define. "implacable thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/implacable/thesaurus/synonyms>