62 entries under tough topic. ×

4
indocile(adjective, control, order, resist)
4
iron(adjective, set, mean, strong, hard)
4
purposeful(adjective, strong, firm, deliberate)
3
solid(adjective, strong, firm, determined)
2
callous(adjective, mean, hard, severe)
2
hard-boiled(adjective, mean, hard, rough)
2
hard-line(adjective, hard, rough, firm)
2
hard as nails(expression, adjective, idiom, firm)
2
incompliant(firm, difficult, fixed, rigid)
2
locked in(expression, adjective, firm, determined)
2
unpliable(adjective, difficult, wild, awkward)
1
aloof(adjective, firm, fixed, rigid)
1
awkward(difficult, irritable, stiff, stubborn)
1
formal(adjective, strong, firm, cold)
1
hard-shelled(adjective, hard, severe, rough)
1
hardboiled(adjective, serious, resolute, persistent)
1
incurable(difficult, persistent, hardened, lasting)
1
rough(adjective, hard, severe, harsh)
1
unfeeling(adjective, mean, hard, harsh)
1
unflexible(adjective, firm, fixed, rigid)
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APASmart Define. (2015). obstinate thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/obstinate/thesaurus/synonyms
ChicagoSmart Define. 2015. "obstinate thesaurus" https://smartdefine.org/obstinate/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, obstinate thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/obstinate/thesaurus/synonyms>.
MLASmart Define. "obstinate thesaurus" 3 August 2015. Web. 30 September 2026. <https://smartdefine.org/obstinate/thesaurus/synonyms>