79 entries under firm topic. ×

1
solid(adjective, certain, steady, substantial)
1
sound(adjective, solid, stable, fixed)
1
stable(adjective, strong, flat, solid)
1
staid(adjective, solid, stable, fixed)
1
staunch(adjective, strong, flat, solid)
1
steady-going(adjective, solid, substantial, stable)
1
unchangeable(adjective, strong, flat, solid)
1
unchanging(adjective, set, clear, solid)
1
undeviating(adjective, strong, flat, solid)
1
unequivocal(adjective, set, clear, total)
1
unmodifiable(adjective, certain, limited, definite)
1
unshakable(adjective, clear, strong, solid)
1
unshaken(adjective, set, clear, strong, flat)
1
unswerving(adjective, set, total, solid)
1
unvarying(adjective, set, clear, solid)
0
allegiant(adjective, solid, intense, stable)
0
balanced(adjective, solid, stable, fixed)
0
brick-wall(adjective, solid, steady, substantial)
0
calm(adjective, solid, stable, fixed)
0
cool(adjective, solid, stable, fixed)
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APASmart Define. (2015). never-failing thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/never-failing/thesaurus/synonyms
ChicagoSmart Define. 2015. "never-failing thesaurus" https://smartdefine.org/never-failing/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2015, never-failing thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/never-failing/thesaurus/synonyms>.
MLASmart Define. "never-failing thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/never-failing/thesaurus/synonyms>