82 entries under hard topic. ×

7
adamantine(adjective, strong, tough, firm)
7
inexorable(adjective, mean, strong, tough)
7
unbending(adjective, mean, strong, tough)
5
unshakable(adjective, mean, strong, tough)
4
implacable(adjective, mean, strong, tough)
4
tough(adjective, mean, strong, firm)
3
grim(adjective, strong, tough, firm)
3
set in stone(expression, adjective, idiom, mean)
3
uncooperative(adjective, mean, tough, difficult)
1
astringent(adjective, strong, tough, severe)
1
astute(adjective, tough, sharp, practical)
1
austere(adjective, strong, tough, severe)
1
authoritarian(adjective, strong, tough, severe)
1
bitter(adjective, strong, tough, severe)
1
bullhead(adjective, mean, harsh, inflexible)
1
by the book(expression, adjective, idiom, strong)
1
cold fish(expression, adjective, mean, stubborn)
1
disciplinary(adjective, strong, tough, severe)
1
dyed-in-the-wool(adjective, strong, tough, severe)
1
flinty(adjective, strong, tough, severe)
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APASmart Define. (2015). mulish thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/mulish/thesaurus/synonyms
ChicagoSmart Define. 2015. "mulish thesaurus" https://smartdefine.org/mulish/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, mulish thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/mulish/thesaurus/synonyms>.
MLASmart Define. "mulish thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/mulish/thesaurus/synonyms>