- unfailing
- adj1. certain, sure, Inf. surefire, tried and true; dependable, reliable, to be depended or relied upon, trustworthy, trusty, as good as one's word; loyal, faithful, constant, true, true-blue; steady, steadfast, staunch, solid; unfading, lasting, enduring, abiding, perpetual.2. inexhaustible, exhaustless, limitless, unlimited, boundless, unbounded, measureless, immeasurable, innumerable, numberless, countless, infinite.3. infallible, unerring, inerrable, incapable of error.
A Note on the Style of the synonym finder. 2014.