1
dogged
1
invariant
1
iron-willed(adjective, determined, resolute, uncompromising, unshakeable)
1
ironclad
1
nonflexible
1
ornery(adjective, tough, firm, unreasonable, grim)
1
persevering
1
persistent
1
purposeful
1
refractory(adjective, tough, firm, unreasonable, grim)
1
rock-ribbed(adjective, determined, resolute, uncompromising, unshakeable)
1
solidified(adjective, firm, rigid, inflexible, unbending)
1
starchy(adjective, firm, rigid, inflexible, unbending)
1
stiff-necked(adjective, determined, resolute, uncompromising, unshakeable)
1
sturdy
1
taut(adjective, firm, rigid, inflexible, unbending)
1
tight(adjective, firm, rigid, inflexible, unbending)
1
unfluctuating
1
unshakeable(adjective, determined, resolute, uncompromising)
1
watertight
13 years ago|2.5k views|share |citing 
APASmart Define. (2013). unbendable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unbendable/thesaurus/synonyms
ChicagoSmart Define. 2013. "unbendable thesaurus" https://smartdefine.org/unbendable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2013, unbendable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unbendable/thesaurus/synonyms>.
MLASmart Define. "unbendable thesaurus" 27 June 2013. Web. 24 September 2026. <https://smartdefine.org/unbendable/thesaurus/synonyms>