tireless

tireless
    adj 1: showing sustained enthusiastic action with unflagging
           vitality; "an indefatigable advocate of equal rights"; "a
           tireless worker"; "unflagging pursuit of excellence"
           [syn: {indefatigable}, {tireless}, {unflagging},
           {unwearying}]
    2: characterized by hard work and perseverance [syn:
       {hardworking}, {industrious}, {tireless}, {untiring}]
    

Tireless \Tire"less\, a.
   Untiring.
   [1913 Webster]
    

88 Moby Thesaurus words for "tireless":
      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