298 entries under adjective topic. ×

13
cruel(appearance, mean, strong, hard)
12
unappeasable(mean, severe, harsh, cruel)
11
hard(mean, strong, tough, severe)
11
pitiless(animal, mean, hard, tough)
10
iron(mean, strong, hard, tough)
10
resolute(hard, firm, determined, resolute)
10
steadfast(tough, firm, determined, resolute)
9
obstinate(mean, hard, cruel, determined)
8
firm(mean, strong, hard, tough)
8
inhuman(animal, mean, hard, tough)
8
mortal(mean, severe, harsh, cruel)
8
steely(strong, hard, tough, determined)
8
vindictive(mean, hard, tough, severe)
7
determined(strong, hard, tough, harsh)
7
dogged(appearance, mean, hard, tough)
7
immovable(mean, strong, hard, tough)
7
stiff-necked(mean, strong, hard, tough)
7
uncompliant(tough, firm, resist, determined)
7
unfeeling(animal, mean, hard, severe)
6
incompliant(resist, determined, resolute, persistent)
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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>