70 entries under adjective topic. ×

2
pigheaded(obstinate, stubborn, unbending)
2
refractory
2
rigorous(hard, resolute, rigid, inflexible)
2
set(hard, stiff, resolute, rigid)
2
stiff(set, hard, resolute, rigid)
2
unchangeable(set, hard, stiff, rigid)
2
unyielding(set, hard, stiff, rigid)
1
dyed-in-the-wool(hard, resolute, rigid, inflexible)
1
hard-and-fast(set, hard, stiff, rigid)
1
headstrong
1
implacable(hard, resolute, rigid, inflexible)
1
impracticable
1
inadaptable
1
inalterable
1
indomitable(hard, resolute, rigid, inflexible)
1
inoperative
1
invalid
1
invariable
1
iron(set, hard, stiff, rigid)
1
irrelative
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APASmart Define. (2016). unadaptable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unadaptable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unadaptable thesaurus" https://smartdefine.org/unadaptable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unadaptable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unadaptable/thesaurus/synonyms>.
MLASmart Define. "unadaptable thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/unadaptable/thesaurus/synonyms>