Synonyms|468Antonyms|98|Broader|6Narrower|0Related|413

50 entries under hard topic. ×

2
adamantine(resolute, rigid, inflexible, strict)
2
implacable(resolute, rigid, inflexible, strict)
2
indomitable(resolute, rigid, inflexible, strict)
2
inexorable(resolute, rigid, inflexible, strict)
2
relentless(adjective, set, strong, firm)
2
strict(rigid, inflexible, obstinate, stubborn)
2
unadaptable(adjective, set, stiff, rigid)
2
unrelenting(adjective, set, stiff, persistent)
1
arbitrary(adjective, severe, rough, harsh)
1
confirmed(adjective, severe, rough, harsh)
1
desperate(adjective, severe, rough, harsh)
1
drastic(adjective, severe, rough, harsh)
1
ferocious(adjective, severe, rough, harsh)
1
fierce(adjective, severe, rough, harsh)
1
hard-and-fast(adjective, set, stiff, rigid)
1
narrow(adjective, severe, rough, harsh)
1
obdurate(adjective, steady, fixed, rigid)
1
pugnacious(adjective, severe, rough, harsh)
1
refractory(adjective, severe, rough, harsh)
1
ruffianly(adjective, severe, rough, harsh)
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ChicagoSmart Define. 2015. "immutable thesaurus" https://smartdefine.org/immutable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, immutable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/immutable/thesaurus/synonyms>.
MLASmart Define. "immutable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/immutable/thesaurus/synonyms>