6
dead in the water
6
direct(adjective, clear, plain, certain, definite)
6
forceful(adjective, clear, strong, sound, heavy)
6
grim(adjective, strong, hard, tough, severe)
6
gritty(strong, steady, resolution, bold, resolute)
6
harden(verb, close, set, settle, solid)
6
harsh(adjective, mean, strong, hard, tough)
6
headstrong(adjective, hard, tough, rough, harsh)
6
hidebound(adjective, moderate, determined, resolute, cautious)
6
impervious(adjective, set, strong, hard, tough)
6
pat(adjective, solid, determined, usual, steady)
6
powerful(adjective, strong, sound, tough, fit)
6
recalcitrant(adjective, tough, persistent, obstinate, stubborn)
6
snug(adjective, tight)
6
solidify(verb, close, set, fix, settle)
6
stated(adjective, characteristic, certain, determined, usual)
6
steadfastly(adverb, hard, fast, severely, thoroughly)
6
stiffen(verb, calm, close, set, fix)
6
trusty(adjective, good, close, strong, correct)
6
unbreakable(adjective, strong, hard, tough, severe)
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APASmart Define. (2016). firm thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/firm/thesaurus/synonyms
ChicagoSmart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, firm thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>.
MLASmart Define. "firm thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms>