tireless

Synonyms and related words:

active, ardent, assiduous, constant, continuing, determined, diligent, dogged, dynamic, enduring, energetic, enthusiastic, faithful, fervent, hard, hardworking, immutable, inalterable, indefatigable, indomitable, industrious, inexhaustible, insistent, invincible, laborious, lasting, lively, loyal, never idle, never-tiring, obstinate, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, rapt, relentless, resolute, sagging, sedulous, single-minded, sleepless, slogging, spirited, stable, staunch, steadfast, steady, strenuous, stubborn, tenacious, unabating, unconquerable, undaunted, undeviating, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unsleeping, unsparing, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, vehement, vigorous, vital, weariless, zealous