Indefatigable
[adj] showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
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Related Terms
abiding, ardent, assiduous, constant, continuing, continuous, determined, diligent, dogged, enduring, energetic, faithful, fervent, hard, hardworking, immutable, inalterable, indomitable, industrious, inexhaustible, insistent, invincible, laborious, lasti