Synonyms of never-failing

1 Syllable

firm, sure, staunch, bound, true, fast

2 Syllables

stubborn, surer, come-through, steadiest, steadier, foolproof, ardent, steadfast, true-blue, rigid, faithful, intent, liege, fixed, stable, constant, steady, surest

3 Syllables

enduring, reliable, unyielding, unflinching, tried-and-true, unfailing, unbending, adamant, allegiant, unswerving, changeless, abiding, relentless, intense

4 Syllables

immobile, immovable, unqualified, obdurate, unfaltering, unwavering, resolute, single-minded, inflexible, unmovable, unquestioning, wholehearted, persevering, dependable, established, dedicated

5 Syllables

inexorable