never-ending

adj

perpetual, eternal, everlasting, timeless, interminable, Sisyphean, endless, unending; ceaseless, incessant, unceasing, nonstop, uninterrupted, continual, continuous, unbroken; unremitting, unintermitting, relentless, unrelenting, persistent; recurrent, recurring, repeated, repetitious.

2. infinite, boundless, illimitable, limitless; immeasurable, measureless, unfathomable, vast.

3. enduring, lasting, abiding, Literary. sempiternal, aeonian, amaranthine, perennial; immutable, constant, unwavering, unfaltering, undiminished; invariable, fixed, durable, stable, permanent, perdurable; steady, steadfast, sustained, regular.