5
firm(adjective, complete, total, solid, certain)
4
steadfast(adjective, strong, complete, flat, firm)
4
steady(adjective, strong, complete, flat, firm)
4
sure(adjective, strong, complete, flat, firm)
4
unfaltering(adjective, complete, firm, total, solid)
4
unqualified(adjective, strong, complete, flat, firm)
4
unwavering(adjective, strong, flat, firm, total)
3
abiding(adjective, strong, complete, flat, firm)
3
perennial
3
unfailing(adjective, set, clear, certain, sure)
3
wholehearted(adjective, set, complete, firm, total)
2
arranged(adjective, certain, limited, definite, inflexible)
2
certain(adjective, set, clear, complete, firm)
2
endless
2
enduring(adjective, strong, complete, flat, firm)
2
eternal
2
fixed(adjective, set, clear, strong, flat)
2
unquestioning(adjective, set, clear, warm, firm)
1
absolute(adjective, complete, total, certain, definite)
1
adamant(adjective, strong, flat, intense, certain)
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APASmart Define. (2015). never-failing thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/never-failing/thesaurus/synonyms
ChicagoSmart Define. 2015. "never-failing thesaurus" https://smartdefine.org/never-failing/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, never-failing thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/never-failing/thesaurus/synonyms>.
MLASmart Define. "never-failing thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/never-failing/thesaurus/synonyms>