144 entries under tough topic. ×

2
intrepid(strong, firm, determined, vigorous)
2
nervy(strong, determined, vigorous, bold)
2
permanent(secure, firm, true, fixed)
2
rebellious(adjective, firm, unreasonable, grim)
2
red-blooded(strong, bold, resolute, spirited)
2
robust(adjective, strong, sound, secure)
2
ropy(adjective, thick, syrupy, tacky)
2
sinewy(adjective, strong, hard, sound)
2
sound(adjective, strong, secure, fit)
2
syrupy(adjective, thick, tacky, sticky)
2
unmanageable(firm, difficult, wild, awkward)
2
valiant(adjective, strong, firm, vigorous)
1
Trojan(strong, bold, resolute, spirited)
1
able(adjective, strong, sound, fit)
1
adventuresome(strong, bold, spirited, brave)
1
adventurous(strong, bold, spirited, brave)
1
assured(strong, bold, resolute, spirited)
1
athletic(adjective, strong, sound, fit)
1
audacious(strong, bold, spirited, brave)
1
awkward(difficult, wild, obstinate, stubborn)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 28 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>