Lassitude

lassitude
    n 1: a state of comatose torpor (as found in sleeping sickness)
         [syn: {lethargy}, {lassitude}, {sluggishness}]
    2: a feeling of lack of interest or energy [syn: {languor},
       {lassitude}, {listlessness}]
    3: weakness characterized by a lack of vitality or energy [syn:
       {inanition}, {lassitude}, {lethargy}, {slackness}]
    

Lassitude \Las"si*tude\ (l[a^]s"s[i^]*t[=u]d), n. [L. lassitudo,
   fr. lassus faint, weary; akin to E. late: cf. F. lassitude.
   See {Late}.]
   A condition of the body, or mind, when its voluntary
   functions are performed with difficulty, and only by a strong
   exertion of the will; languor; debility; weariness.
   [1913 Webster]

         The corporeal instruments of action being strained to a
         high pitch . . . will soon feel a lassitude. --Barrow.
   [1913 Webster]
    

91 Moby Thesaurus words for "lassitude":
      acedia, adynamia, anemia, apathy, atony, blah feeling,
      bloodlessness, blues, boredom, brain fag, cachexia, cachexy,
      cowardice, debilitation, debility, depression, disinterest,
      disregard, doldrums, drowsiness, dullness, dumps, enervation,
      enfeeblement, ennui, etiolation, exhaustion, eyestrain, faintness,
      fatigue, feebleness, flabbiness, flaccidity, goneness,
      heart strain, heaviness, hebetude, heedlessness, impotence,
      inanimation, indifference, insouciance, jadedness,
      lackadaisicalness, languidness, languishment, languor,
      languorousness, lenitude, lentor, lethargy, lifelessness,
      listlessness, mental fatigue, mental strain, oscitancy, overstrain,
      overtiredness, passivity, phlegm, powerlessness, prostration,
      satedness, sleep, sleepiness, sloth, slothfulness, slowness,
      sluggishness, slumber, softness, somnolence, stance fatigue,
      strain, strengthlessness, stupefaction, stupor, supineness, tedium,
      tiredness, torpidity, torpidness, torpitude, torpor, unconcern,
      unmindfulness, weakliness, weakness, wearifulness, weariness,
      world-weariness