72 entries under solid topic. ×

1
steady-going(adjective, firm, substantial, stable)
1
unchangeable(adjective, strong, flat, firm)
1
unchanging(adjective, set, clear, firm)
1
undeviating(adjective, strong, flat, firm)
1
unshakable(adjective, clear, strong, firm)
1
unshaken(adjective, set, clear, strong, flat)
1
unswerving(adjective, set, firm, total)
1
unvarying(adjective, set, clear, firm)
0
allegiant(adjective, firm, intense, stable)
0
balanced(adjective, firm, stable, fixed)
0
brick-wall(adjective, firm, steady, substantial)
0
calm(adjective, firm, stable, fixed)
0
cool(adjective, firm, stable, fixed)
0
durable(adjective, firm, substantial, stable)
0
equable(adjective, firm, substantial, stable)
0
even(adjective, firm, substantial, stable)
0
fast(adjective, firm, intense, stable)
0
liege(adjective, firm, intense, stable)
0
patterned(adjective, firm, substantial, stable)
0
poised(adjective, firm, stable, fixed)
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APASmart Define. (2015). never-failing thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/never-failing/thesaurus/synonyms
ChicagoSmart Define. 2015. "never-failing thesaurus" https://smartdefine.org/never-failing/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, never-failing thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/never-failing/thesaurus/synonyms>.
MLASmart Define. "never-failing thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/never-failing/thesaurus/synonyms>