338 entries under strong topic. ×

4
physical(adjective, hard, solid, material)
4
plucky(adjective, bold, resolute, spirited)
4
potent(adjective, clear, sound, tough)
4
rocklike(adjective, hard, substantial, stiff)
4
secured(adjective, secure, stable, unmoving)
4
serious(adjective, hard, tough, severe)
4
spunky(adjective, determined, bold, resolute)
4
stiff-necked(adjective, mean, hard, tough)
4
true-blue(adjective, good, close, correct)
4
unequivocal(adjective, good, clear, certain)
3
able-bodied(adjective, sound, tough, fit)
3
authoritarian(adjective, hard, tough, severe)
3
brawny(adjective, fit, determined, healthy)
3
bullheaded(adjective, hard, tough, determined)
3
conclusive(adjective, clear, certain, definite)
3
deep-rooted(adjective, calm, steady, even)
3
doughty(bold, courage, spirited, brave)
3
everlasting(adjective, tough, persistent, continuous)
3
gutsy(adjective, determined, bold, resolute)
3
hard-line(adjective, hard, tough, severe)
10 years ago|51k views|share |citing 
APASmart Define. (2016). firm thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/firm/thesaurus/synonyms
ChicagoSmart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, firm thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>.
MLASmart Define. "firm thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms>