128 entries under resolute topic. ×

32
steadfast(adjective, strong, secure, tough, flat)
30
insistent(adjective, determined, obstinate, uncompromising)
29
adamantine(adjective, strong, hard, tough, firm)
25
tough(adjective, mean, strong, hard, severe)
24
implacable(adjective, mean, strong, hard, tough)
24
unbendable(adjective, firm, resist, determined, unreasonable)
23
hard-nosed(adjective, mean, strong, hard, secure)
21
dogged(adjective, mean, strong, hard, tough)
21
mulish(adjective, mean, strong, hard, tough)
20
inelastic(adjective, hard, tough, firm, solid)
20
stern(adjective, hard, tough, severe, rough)
19
tenacious(adjective, strong, determined, obstinate)
18
unwavering(adjective, strong, secure, flat, firm)
16
grim(adjective, strong, hard, tough, severe)
16
resolved(adjective, strong, severe, flat, firm)
15
iron(adjective, mean, strong, hard, tough)
15
pertinacious(adjective, determined, obstinate, stubborn)
15
pigheaded(adjective, mean, hard, firm, deliberate)
15
unshakeable(adjective, determined, uncompromising)
13
headstrong(adjective, strong, hard, tough, rough)
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APASmart Define. (2016). inflexible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>