lethargic

lethargic
    adj 1: deficient in alertness or activity; "bullfrogs became
           lethargic with the first cold nights" [syn: {lethargic},
           {unenrgetic}] [ant: {energetic}]
    

Lethargic \Le*thar"gic\ (l[-e]*th[aum]r"j[i^]k), Lethargical
\Le*thar"gic*al\ (-j[i^]*kal), a. [L. lethargicus, Gr.
   lhqargiko`s: cf. F. l['e]thargique. See {Lethargy}.]
   Pertaining to, affected with, or resembling, lethargy;
   morbidly drowsy; dull; heavy. -- {Le*thar"gic*al*ly}, adv. --
   {Le*thar"gic*al*ness}, n. -- {Le*thar"gic*ness}, n.
   [1913 Webster]
    

120 Moby Thesaurus words for "lethargic":
      Laodicean, Olympian, aloof, anesthetized, apathetic, benumbed,
      blah, blase, bored, cataleptic, comatose, dead, debilitated,
      desensitized, detached, dilatory, disinterested, doped, dopey,
      dormant, dozy, dreamy, droopy, drowsy, drugged, drugged with sleep,
      dull, enervated, exanimate, exhausted, fagged out, faineant,
      fatigued, half asleep, heartless, heavy, heavy with sleep,
      heavy-eyed, hebetudinous, hopeless, idle, impassive, in a stupor,
      inactive, inanimate, indifferent, indolent, inert, insouciant,
      jaded, lackadaisical, laggard, languid, languorous, lazy, leaden,
      lifeless, listless, lumpish, moribund, napping, narcoleptic,
      narcose, narcotized, narcous, nodding, nonchalant, numb, numbed,
      oscitant, out of it, passive, phlegmatic, pluckless, pooped,
      resigned, sated, sedated, slack, sleep-drowned, sleep-drunk,
      sleep-filled, sleep-swollen, sleepful, sleepy, slothful, slow,
      sluggish, slumberous, slumbery, snoozy, somnolent, soporific,
      spiritless, spunkless, stagnant, stagnating, stoic, stolid,
      stretchy, stultified, stupefied, stupid, stuporose, stuporous,
      supine, tired, torpid, uncaring, unconcerned, uninterested,
      vegetable, vegetative, wan, weak, weary, withdrawn, world-weary,
      yawning, yawny