79 entries under hard topic. ×

4
unrelenting(adjective, close, strong, tough)
3
dense(adjective, strong, tough, solid)
3
immovable(adjective, strong, tough, sturdy)
3
inexorable(adjective, close, strong, tough)
3
rough(adjective, strong, tough, serious)
3
rugged(adjective, strong, tough, harsh)
2
austere(adjective, strong, tough, severe)
2
forbidding(adjective, close, strong, tough)
2
hard-core(adjective, strong, tough, severe)
2
hard as nails(expression, adjective, idiom, strong)
2
implacable(adjective, strong, tough, severe)
2
leathery(adjective, strong, solid, stiff)
2
resistant(adjective, strong, solid, stiff)
2
steeled(adjective, strong, solid, stiff)
2
strict(adjective, strong, tough, severe)
2
strong(adjective, tough, solid, stiff)
2
sturdy(adjective, strong, tough, solid)
2
unsparing(adjective, close, strong, tough)
1
astringent(adjective, close, strong, tough)
1
authoritarian(adjective, strong, tough, severe)
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APASmart Define. (2015). flinty thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/flinty/thesaurus/synonyms
ChicagoSmart Define. 2015. "flinty thesaurus" https://smartdefine.org/flinty/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, flinty thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/flinty/thesaurus/synonyms>.
MLASmart Define. "flinty thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/flinty/thesaurus/synonyms>