48 entries under hard topic. ×

1
graceless(adjective, firm, solid, tense)
1
immalleable(adjective, firm, solid, stiff)
1
impliable(adjective, firm, solid, stiff)
1
incompliant(adjective, firm, solid, tense)
1
inelastic(adjective, firm, solid, stiff)
1
inflexible(adjective, firm, solid, rigid)
1
jelled(adjective, firm, solid, tense)
1
mechanical(adjective, firm, solid, tense)
1
refractory(adjective, firm, solid, tense)
1
resistant(adjective, firm, solid, tense)
1
rheumatic(adjective, firm, solid, tense)
1
rigid(adjective, firm, solid, stiff)
1
starched(verb, adjective, firm, solid)
1
starchy(adjective, firm, solid, tense)
1
stark(adjective, firm, solid, tense)
1
steely(adjective, firm, solid, tense)
1
stony(adjective, firm, solid, rigid)
1
taut(adjective, strong, secure, firm)
1
tense(adjective, firm, solid, stiff)
1
thick(adjective, firm, solid, stiff)
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APASmart Define. (2016). petrified thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/petrified/thesaurus/synonyms
ChicagoSmart Define. 2016. "petrified thesaurus" https://smartdefine.org/petrified/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, petrified thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/petrified/thesaurus/synonyms>.
MLASmart Define. "petrified thesaurus" 23 March 2016. Web. 26 September 2026. <https://smartdefine.org/petrified/thesaurus/synonyms>