A dreamy weariness; a slowed vitality that can be either illness-like or voluptuously restful, energy lowered into softness (literary). Often carries a sensual stillness. The body unhurried, the mind drifting.

From Latin langor "faintness, listlessness," from languēre "to be faint, to droop." English inherited both the weakness and the elegance, allowing the word to mean collapse or leisure masquerading as it.