Synonyms and related words :
ardent, assiduous, constant, continuing, diligent, dogged, enduring, energetic, faithful, fervent, going strong, hard, hardworking, immutable, in full force, in full swing, inalterable, indefatigable, indomitable, industrious, inexhaustible, insistent, invincible, laborious, lasting, loyal, never idle, never-tiring, obstinate, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, rapt, relentless, resolute, sedulous, single-minded, sleepless, slogging, stable, steadfast, steady, strenuous, stubborn, tenacious, tireless, unabated, unabating, unallayed, unbated, unconquerable, undaunted, undiminished, undiscouraged, undrooping, unexhausted, unfaded, unfailing, unfaltering, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unshaken, unsleeping, unsparing, unswerving, untiring, unwavering, unweakened, unweakening, unwearied, unwearying, unwinking, unwithered, unworn, utterly attentive, vehement, weariless, zealous