263 entries under tough topic. ×

6
hardened(adjective, set, hard, firm)
6
opinionated(adjective, violent, wild, determined)
6
rebellious(adjective, firm, inflexible, stubborn)
6
single-minded(adjective, firm, harsh, cruel)
6
stalwart(adjective, strong, hard, sound)
5
dense(adjective, set, strong, hard)
5
hard-core(adjective, strong, hard, firm)
5
hard-line(adjective, strong, hard, severe)
5
impenetrable(adjective, set, hard, firm)
5
impervious(adjective, hard, solid, rigid)
5
rugged(adjective, strong, hard, sound)
5
true(adjective, strong, flat, firm)
5
uncooperative(adjective, mean, hard, harsh)
4
concrete(adjective, set, hard, firm)
4
exacting(adjective, easy, severe, painful)
4
fractious(adjective, unpleasant, deliberate, determined)
4
hard-hearted(adjective, mean, hard, harsh)
4
stark(adjective, strong, hard, sound)
4
sure(adjective, strong, flat, firm)
4
wayward(adjective, difficult, obstinate, stubborn)
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APASmart Define. (2016). unyielding thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/unyielding/thesaurus/synonyms
ChicagoSmart Define. 2016. "unyielding thesaurus" https://smartdefine.org/unyielding/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, unyielding thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unyielding/thesaurus/synonyms>.
MLASmart Define. "unyielding thesaurus" 10 March 2016. Web. 1 October 2026. <https://smartdefine.org/unyielding/thesaurus/synonyms>