191 entries under tough topic. ×

6
dense(adjective, set, strong, hard)
6
finicky(adjective, harsh, strict, thorough)
6
fussy(adjective, harsh, strict, particular)
6
headstrong(adjective, firm, unreasonable, inflexible)
6
oppressive(adjective, hard, severe, rough)
6
persevering(adjective, firm, determined, unreasonable)
5
Draconian(adjective, severe, firm, harsh)
5
aloof(adjective, cool, firm, fair)
5
dead set(expression, adjective, severe, firm)
5
difficult(adjective, hard, severe, rough)
5
distant(adjective, firm, cold, unfriendly)
5
hardened(adjective, strong, hard, firm)
5
sturdy(adjective, close, set, strong, hard)
4
astringent(adjective, strong, hard, severe)
4
authoritarian(adjective, strong, hard, severe)
4
compact(adjective, close, set, strong, hard)
4
compressed(adjective, set, strong, hard)
4
contumacious(adjective, firm, persistent, obstinate)
4
fastidious(adjective, grim, particular, problematic)
4
hard-core(adjective, strong, hard, severe)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>