languorous (adj.)

late 15c., "mournful," from Old French langoros "ill, ailing, suffering, languishing" (11c., Modern French langoureux), from langor "sickness, weakness" (see languor). Meaning "suggestive of languor, weariness, or want of energy," often with a suggestion of seductiveness, is from 1821. Related: Languorously; languorousness.