(n.) The quality or state of being weary or tried; lassitude; exhaustion of strength; fatigue.

acedia adynamia anemia apathy atony blah feeling bloodlessness boredness boredom brain fag bromidic cachexia cachexy cowardice debilitation debility dispiritedness drowsiness dry dryasdust dull dullness dusty enervation enfeeblement ennui etiolation exhaustion eyestrain faintness fatigue fed-upness feebleness flabbiness flaccidity goneness heart strain heaviness hebetude impotence inanimation indifference insipid jadedness lackadaisicalness languidness languishment languor languorousness lassitude lenitude lentor lethargy life-weariness lifelessness listlessness melancholy mental fatigue mental strain oscitancy overstrain overtiredness passivity phlegm prostration satedness satiation satiety sleepiness sloth slothfulness slowness sluggishness softness somnolence spleen stance fatigue strain strengthlessness stupefaction stupor supineness taedium vitae tedious tiredness torpidity torpidness torpitude torpor uninteresting weakliness weakness weariful wearifulness world-weariness