lassitude

noun

1. weariness of body or mind from strain, oppressive climate, etc.; lack of energy; listlessness; languor.
2. a condition of indolent indifference: the pleasant lassitude of the warm summer afternoon.

noun

1. physical or mental weariness

n.early 15c., from Middle French lassitude (14c.), from Latin lassitudinem (nominative lassitudo) “faintness, weariness,” from lassus “faint, tired, weary,” from PIE *led- “slow, weary” (cf. Old English læt “sluggish, slow;” see late (adj.)), from root *le- “to let go, slacken” (see lenient). n.

1. A state or feeling of weariness, diminished energy, or listlessness.