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50 entries under hard topic. ×

1
incompliant(adjective, firm, solid, tense)
1
indurate(adjective, firm, solid, stiff)
1
inelastic(adjective, firm, solid, stiff)
1
inflexible(adjective, firm, solid, stiff)
1
jelled(adjective, firm, solid, tense)
1
mechanical(adjective, firm, solid, tense)
1
numbed(adjective, firm, solid, tense)
1
ossified(adjective, firm, solid, tense)
1
petrified(adjective, firm, solid, tense)
1
refractory(adjective, firm, solid, tense)
1
resistant(adjective, firm, solid, tense)
1
rheumatic(adjective, firm, solid, stiff)
1
rigid(adjective, firm, solid, stiff)
1
set(adjective, firm, solid, stiff)
1
solid(adjective, firm, stiff, tense)
1
solidified(adjective, firm, solid, tense)
1
starched(adjective, firm, solid, stiff)
1
starchy(adjective, firm, solid, tense)
1
stark(adjective, firm, solid, tense)
1
stiff(adjective, firm, dead, rigid)
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APASmart Define. (2011). stiff as a board thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/stiff_as_a_board/thesaurus/synonyms
ChicagoSmart Define. 2011. "stiff as a board thesaurus" https://smartdefine.org/stiff_as_a_board/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2011, stiff as a board thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/stiff_as_a_board/thesaurus/synonyms>.
MLASmart Define. "stiff as a board thesaurus" 24 May 2011. Web. 30 September 2026. <https://smartdefine.org/stiff_as_a_board/thesaurus/synonyms>