69 entries under solid topic. ×

42
firm(noun, adjective, clear, strong, sound)
38
determined(adjective, clear, strong, tough, severe)
36
resolute(adjective, clear, strong, tough, severe)
28
unyielding(adjective, clear, strong, sound, tough)
25
steadfast(adjective, clear, strong, secure, tough)
16
set(adjective, strong, secure, flat, firm)
16
staunch(adjective, clear, strong, sound, tough)
13
indefatigable(adjective, strong, tough, fit, firm)
13
fixed(adjective, strong, sound, secure, tough)
13
strong(adjective, sound, secure, tough, fit)
11
stalwart(adjective, strong, sound, tough, fit)
11
unflagging(adjective, strong, tough, fit, firm)
10
immovable(adjective, strong, secure, firm)
10
sturdy(adjective, strong, sound, tough, fit)
9
fast(adjective, strong, free, secure, tough)
8
stout(adjective, strong, sound, tough, fit)
8
vigorous(adjective, strong, sound, tough, fit)
7
enduring(adjective, strong, sound, tough, fit)
7
hearty(adjective, strong, sound, tough, fit)
7
secure(adjective, strong, sound, free, tough)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 21 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>