148 entries under obstinate topic. ×

22
sure(adjective, calm, good, close, clear)
21
dogged(adjective, mean, strong, hard, tough)
20
unbendable(adjective, determined, unreasonable, resolute, rigid)
18
adamantine(adjective, strong, hard, tough, determined)
16
strict(adjective, close, strong, hard, tough)
14
iron(noun, adjective, mean, strong, hard)
14
persevering(adjective, strong, tough, certain, determined)
14
true(adjective, good, close, clear, strong)
14
unchangeable(adjective, calm, strong, secure, moderate)
12
hard-nosed(adjective, mean, clear, strong, hard)
12
severe(adjective, clear, strong, hard, tough)
12
stalwart(adjective, calm, strong, sound, tough)
12
steely(adjective, strong, hard, tough, solid)
12
stern(adjective, hard, tough, severe, rough)
12
taut(adjective, strong, hard, secure, rough)
11
confirmed(adjective, characteristic, hard, rough, harsh)
10
immutable(adjective, calm, strong, hard, secure)
10
pertinacious(adjective, strong, tough, determined, steady)
10
single-minded(adjective, tough, solid, intense, deliberate)
10
strong-willed(adjective, strong, tough, intense, deliberate)
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APASmart Define. (2016). firm thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/firm/thesaurus/synonyms
ChicagoSmart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, firm thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>.
MLASmart Define. "firm thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms>