103 entries under hard topic. ×

4
fixed(adjective, close, strong, sound)
4
refractory(adjective, tough, solid, rigid)
4
steely(strong, tough, rugged)
4
stubborn(adjective, strong, tough, firm)
4
tight(adjective, close, strong, tough)
3
dense(adjective, person, close, set, body)
3
material(adjective, strong, solid, big)
3
physical(adjective, strong, fit, substantial)
2
adamant(adjective, strong, tough, firm)
2
close(adjective, set, strong, tough)
2
compact(adjective, close, set, strong)
2
flinty(adjective, strong, tough, solid)
2
hard as nails(expression, adjective, idiom, strong)
2
immovable(adjective, strong, tough, firm)
2
rock-solid(adjective, compact, dense, rock-hard)
2
rough(adjective, strong, tough, vigorous)
2
set(adjective, calm, strong, tough)
2
thick(adjective, person, close, set, body)
2
unbending(adjective, close, strong, tough)
1
brick wall(expression, adjective, calm, strong)
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APASmart Define. (2016). sturdy thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sturdy/thesaurus/synonyms
ChicagoSmart Define. 2016. "sturdy thesaurus" https://smartdefine.org/sturdy/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, sturdy thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sturdy/thesaurus/synonyms>.
MLASmart Define. "sturdy thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/sturdy/thesaurus/synonyms>