147 entries under determined topic. ×

14
rigid(adjective, resolute, persistent, obstinate)
14
uncompromising(adjective, tough, firm, resolute)
14
unfaltering(adjective, strong, firm, intense, deliberate)
13
indefatigable(adjective, strong, tough, fit, firm)
13
fixed(adjective, strong, sound, secure, tough)
13
resolved(adjective, strong, flat, firm)
13
strong(adjective, sound, secure, tough, fit)
12
intransigent(adjective, strong, firm, unreasonable)
12
sticky(adjective, secure, thick, coherence)
12
stiff(adjective, strong, resolute, persistent)
12
tireless(adjective, strong, firm, steady)
11
insistent(adjective, resolute, obstinate, uncompromising)
11
stalwart(adjective, strong, sound, tough, fit)
11
strong-willed(adjective, strong, firm, intense, deliberate)
11
unflagging(adjective, strong, tough, fit, firm)
10
immovable(adjective, strong, secure, firm, solid)
10
indomitable(adjective, strong, tough, firm, difficult)
10
purposeful(adjective, strong, firm, serious)
10
unflinching(adjective, strong, flat, firm)
10
untiring(adjective, persevering)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 24 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>