210 entries under hard topic. ×

4
taut(adjective, rough, firm, harsh)
4
unfeeling(adjective, mean, tough, severe)
4
unsusceptible(adjective, careless, indifferent, cruel)
3
cold-blooded(adjective, person, careless, indifferent)
3
compressed(adjective, set, strong, tough)
3
condensed(adjective, tough, solid, rigid)
3
dense(adjective, close, set, strong)
3
hard-and-fast(adjective, strict, obstinate, stubborn)
3
impenetrable(adjective, set, strong, tough)
3
impervious(adjective, tough, solid, rigid)
3
impliable(adjective, firm, solid, stiff)
3
indifferent(adjective, careless, cruel, apathetic)
3
insensitive(adjective, careless, indifferent, cruel)
3
starched(adjective, firm, solid, stiff)
3
stark(adjective, severe, firm, solid)
3
strong(adjective, set, tough, flat)
3
tense(adjective, firm, solid, stiff)
2
uncompassionate(adjective, person, mean, careless)
2
apathetic(adjective, person, careless, indifferent)
2
astringent(adjective, strong, tough, severe)
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APASmart Define. (2016). inflexible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>