395 entries under adjective topic. ×

14
mulish(strong, tough, firm, resist)
14
retentive(strong, unyielding, sticky, retention)
14
rigid(determined, resolute, persistent, obstinate)
14
uncompromising(tough, firm, determined, resolute)
14
unfaltering(strong, firm, intense, deliberate)
13
indefatigable(strong, tough, fit, firm)
13
fixed(strong, sound, secure, tough)
13
resolved(strong, flat, firm, determined)
13
strong(sound, secure, tough, fit)
12
intransigent(strong, firm, determined, unreasonable)
12
sticky(secure, determined, thick, coherence)
12
stiff(strong, determined, resolute, persistent)
12
tireless(strong, firm, determined, steady)
11
glutinous(secure, tough, thick, tacky)
11
insistent(determined, resolute, obstinate, uncompromising)
11
refractory(tough, firm, difficult, wild)
11
stalwart(strong, sound, tough, fit)
11
strong-willed(strong, firm, intense, deliberate)
11
unflagging(strong, tough, fit, firm)
11
viscous(secure, tough, thick, tacky)
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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>