unfailing adj

1 not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test" [syn: foolproof]

2 always able to supply more; "an unfailing source of good stories"; "a subject of unfailing interest"

3 unceasing; "unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy" [syn: unflagging]

English

Adjective

unfailing

1. inexhaustible
2. changeless
3. infallible

abiding, assiduous, calculable, certain, changeless, consistent, constant, continuing, dependable, devoted, diligent, dogged, durable, enduring, faithful, faithworthy, fast, firm, fixed, frozen, immobile, immutable, inalterable, indefatigable, indomitable, industrious, insistent, intact, invariable, invincible, inviolate, lasting, loyal, marble-constant, never-tiring, obstinate, patient, patient as Job, permanent, perpetual, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, predictable, preoccupied, quiescent, rapt, relentless, reliable, remaining, resolute, rigid, secure, sedulous, single-minded, sleepless, slogging, solid, sound, stable, static, stationary, staunch, staying, steadfast, steady, stubborn, substantial, sure, surefire, sustained, tenacious, tireless, torpid, true, true-blue, trustworthy, trusty, unabating, unaltered, unchangeable, unchanged, unchanging, unchecked, unconquerable, undaunted, undestroyed, undiscouraged, undrooping, unfading, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unshifting, unsleeping, unswerving, untiring, unvaried, unvarying, unwavering, unwearied, unwearying, unwinking, utterly attentive, weariless, well-founded, well-grounded