lassitude

A state or feeling of weariness, diminished energy, or listlessness. synonym: lethargy.

The state of having the energies weakened; weakness; weariness; languor of body or mind.

Synonyms Weariness, etc. See fatique.

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.

Lethargy or lack of energy; fatigue.