unwavering, unswerving, unstinting, unflagging, unfaltering, undying, steadfast, untiring, unyielding, unerring, unhesitating, unshakeable, unstinted, unflinching, tireless, chronological age, unfeigned, unfading, unshakable, indefatigable, unbending, impeccable, uncompromising, unsurpassed, unquestionable, boundless, preternatural, abiding, everlasting, good naturedness, wholehearted, exemplary, unalloyed, matchless, unquestioning, unceasing, peerless, utmost, selfless, undeviating, unparalleled, irreproachable, uttermost, ardent, admirable, steely, pertinacious, unvarying, implacable, undiminished, unimpeachable, unremitting, truest, unabashed, sincere, ungrudging, unequaled, inexhaustible, unrivaled, fervent, indomitable, uncanny, indubitable, unmatched, unparallel, ceaseless, eternal, vivifying, adamantine, unsurpassable, incomparable, unquestioned, unrelenting, innate, immeasurable, unostentatious, undimmed, unexcelled, cardinal virtues, exceptional, heartfelt, theological virtues, unconditional, noetic, enduring, nonpareil, irrepressible, supernal, divine, incorruptible, loyal, ineffable, endearing, imperishable, dependable, guileless, outmost, principled, dauntless, noblesse oblige, profoundest, unending, neverfailing, infallible, unbounded, surer, found, cultivate, exhaustless

sure, sureness

constant, foolproof