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1. Moby Thesaurus II by Grady Ward, 1.0
Argus-eyed, agile, alert, alive, all ears, all eyes, ardent, assiduous, attentive, aux aguets, awake, bright, constant, continuing, custodial, diligent, disturbed, dogged, eagle-eyed, enduring, energetic, faithful, fervent, guarded, hard, hardworking, hawk-eyed, immutable, inalterable, indefatigable, indomitable, industrious, insistent, insomniac, insomnious, invincible, keen, keen-eyed, laborious, lasting, lidless, loyal, never idle, never-tiring, nimble, observant, obstinate, on guard, on the, on the alert, on the ball, on the job, on the lookout, on the watch, open-eyed, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, prompt, prudent, qui vive, quick, rapt, ready, relentless, resolute, restless, sedulous, sharp, sharp-eyed, single-minded, slogging, slumberless, smart, stable, steadfast, steady, strenuous, stubborn, tenacious, tireless, unabating, unblinking, unconquerable, undaunted, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unsleeping, unsparing, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, vehement, vigilant, wakeful, wary, watchful, weariless, wide-awake, with open eyes, zealous
Dictionary Results for sleepless:
1. WordNet® 3.0 (2006)
    adj 1: experiencing or accompanied by sleeplessness; "insomniac
           old people"; "insomniac nights"; "lay sleepless all
           night"; "twenty watchful, weary, tedious nights"-
           Shakespeare [syn: insomniac, sleepless, watchful]
    2: always watchful; "to an eye like mine, a lidless watcher of
       the public weal"- Alfred Tennyson [syn: lidless,

2. The Collaborative International Dictionary of English v.0.48
Sleepless \Sleep"less\, a.
   1. Having no sleep; wakeful.
      [1913 Webster]

   2. Having no rest; perpetually agitated. "Biscay's sleepless
      bay." --Byron.
      [1913 Webster] -- Sleep"less*ly, adv. --
      Sleep"less*ness, n.
      [1913 Webster]

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