ennui

ennui
    n 1: the feeling of being bored by something tedious [syn:
         {boredom}, {ennui}, {tedium}]
    

Ennui \En`nui"\, n. [F., fr. L. in odio in hatred. See {Annoy}.]
   A feeling of weariness and disgust; dullness and languor of
   spirits, arising from satiety or want of interest; tedium.
   --T. Gray.
   [1913 Webster]
    

101 Moby Thesaurus words for "ennui":
      acedia, angst, anguish, anxiety, apathy, blues, boredness, boredom,
      cheerlessness, dejection, depression, discomfort, discomposure,
      discontent, dislike, dispiritedness, displeasure, disquiet,
      dissatisfaction, doldrums, dread, drowsiness, dullness, dumps,
      emptiness, enervation, existential woe, fatigue, fed-upness,
      flatness, grimness, heaviness, hebetude, inanimation, indifference,
      inquietude, jadedness, joylessness, lack of pleasure,
      lackadaisicalness, languidness, languishment, languor,
      languorousness, lassitude, lenitude, lentor, lethargy,
      life-weariness, lifelessness, listlessness, malaise, melancholy,
      nausea, nongratification, nonsatisfaction, oscitancy, painfulness,
      pall, passivity, phlegm, sadness, satedness, satiation, satiety,
      savorlessness, sleepiness, sloth, slothfulness, slowness,
      sluggishness, somnolence, spiritlessness, spleen, staleness,
      stupefaction, stupor, supineness, surfeit, taedium vitae,
      tastelessness, tediousness, tedium, tire, tiredness, torpidity,
      torpidness, torpitude, torpor, uncomfortableness, unease,
      uneasiness, unhappiness, unpleasure, unsatisfaction,
      vexation of spirit, wearifulness, weariness, weary,
      world-weariness, yawn