124 entries under hard topic. ×

1
physical(adjective, strong, substantial, sturdy)
1
rheumatic(adjective, firm, solid, stiff)
1
rock(adjective, strong, substantial, sturdy)
1
rocklike(adjective, strong, substantial, sturdy)
1
safe(adjective, clear, strong, sound)
1
starched(adjective, firm, solid, stiff)
1
starchy(adjective, firm, solid, stiff)
1
stiff-necked(adjective, mean, tough, firm)
1
stiff as a board(expression, adjective, idiom, firm)
1
thick-skinned(adjective, mean, tough, harsh)
1
tough nut to crack(expression, adjective, idiom, mean)
1
unassailable(adjective, clear, sound, firm)
1
uncompassionate(adjective, mean, tough, harsh)
1
uncooperative(adjective, mean, tough, harsh)
1
unfeeling(adjective, mean, tough, harsh)
1
unflexible(adjective, firm, solid, rigid)
1
ungraceful(adjective, firm, solid, stiff)
1
unimpressible(adjective, mean, tough, harsh)
1
unsupple(adjective, firm, solid, stiff)
1
unsympathetic(adjective, mean, tough, harsh)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 22 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>