263 entries under tough topic. ×

39
stable(adjective, strong, hard, sound, secure)
38
sound(adjective, strong, hard, strain)
34
refractory(adjective, hard, strain, rough)
33
fixed(adjective, mean, strong, hard, sound)
31
set(adjective, strong, hard, secure)
29
steady(adjective, strong, sound, secure)
28
adamantine(adjective, strong, hard, firm)
25
tight(adjective, close, strong, hard)
24
dogged(adjective, appearance, mean, strong, hard)
24
tenacious(adjective, clear, strong, sound)
24
unshakable(adjective, mean, strong, hard, secure)
23
intractable(adjective, appearance, hard, rough)
22
durable(adjective, strong, sound, strain)
22
pertinacious(adjective, determined, resolute, obstinate)
21
headstrong(adjective, hard, rough, harsh)
21
enduring(adjective, strong, sound, strain)
21
implacable(adjective, appearance, mean, strong, hard)
20
stout(adjective, strong, sound, strain)
19
fast(adjective, strong, secure, strain)
19
robust(adjective, strong, hard, sound)
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APASmart Define. (2016). unyielding thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unyielding/thesaurus/synonyms
ChicagoSmart Define. 2016. "unyielding thesaurus" https://smartdefine.org/unyielding/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, unyielding thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unyielding/thesaurus/synonyms>.
MLASmart Define. "unyielding thesaurus" 10 March 2016. Web. 30 September 2026. <https://smartdefine.org/unyielding/thesaurus/synonyms>