151 entries under stable topic. ×

8
fastened(adjective, strong, sound, secure, short)
7
bound(adjective, set, strong, tough, intense)
6
trusty(adjective, good, close, strong, correct)
5
balanced(adjective, calm, strong, secure, easy)
5
never-failing(adjective, complete, total, solid, certain)
5
petrified(adjective, calm, set, strong, hard)
5
unfailing(adjective, good, set, clear, strong)
4
bolted(adjective, strong, secure, fast, short)
4
cemented(adjective, set, strong, hard, secure)
4
closed(adjective, strong, secure, unmoving)
4
continuous(adjective, complete, wild, steady, original)
4
embedded(adjective, strong, secure, unmoving)
4
hearty(adjective, strong, sound, complete, tough)
4
motionless(adjective, calm, strong, secure, moving)
4
secured(adjective, strong, secure, unmoving)
4
true-blue(adjective, good, close, strong, correct)
4
unquestioning(adjective, set, clear, solid, certain)
3
allegiant(adjective, close, correct, continue, honest)
3
intense(adjective, clear, tough, severe, harsh)
3
nailed(adjective, calm, strong, secure, solid)
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APASmart Define. (2016). firm thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/firm/thesaurus/synonyms
ChicagoSmart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, firm thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>.
MLASmart Define. "firm thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms>