117 entries under persistent topic. ×

64
inexorable(adjective, appearance, mean, strong, hard)
60
inflexible(adjective, mean, strong, hard, tough)
59
relentless(adjective, animal, appearance, mean, strong)
53
uncompromising(adjective, mean, hard, tough, severe)
53
unyielding(adjective, appearance, mean, strong, hard)
53
rigid(adjective, mean, strong, hard, tough)
47
obdurate(adjective, mean, strong, hard, tough)
46
unbending(adjective, mean, strong, hard, tough)
40
determined(adjective, severe, harsh, cruel, fierce)
36
firm(noun, adjective, mean, strong, hard)
30
adamant(adjective, mean, strong, hard, tough)
29
adamantine(adjective, strong, hard, tough, resist)
28
stiff(adjective, tough, severe, firm, harsh)
26
implacable(adjective, animal, appearance, mean, strong)
26
grim(adjective, animal, appearance, mean, strong)
23
fixed(adjective, mean, hard, firm, determined)
22
harsh(adjective, mean, strong, hard, tough)
21
obstinate(adjective, mean, strong, hard, tough)
20
unshakable(adjective, mean, hard, tough, certain)
19
hard(adjective, mean, strong, tough, severe)
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APASmart Define. (2015). unrelenting thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unrelenting/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrelenting thesaurus" https://smartdefine.org/unrelenting/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unrelenting thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unrelenting/thesaurus/synonyms>.
MLASmart Define. "unrelenting thesaurus" 3 August 2015. Web. 22 September 2026. <https://smartdefine.org/unrelenting/thesaurus/synonyms>