noun

a feeling of being drained of energy or vitality; fatigue.

a sense of enervation

fatigue,exhaustion,tiredness,overtiredness,weariness,lassitude,lack of energy,lack of vitality,devitalization,weakness,feebleness,impotence,enfeebled state,debilitation,incapacitation,indisposition,prostration,immobility,weediness,asthenia