lassitude Meaning, Definition & Usage

  1. noun a state of comatose torpor (as found in sleeping sickness)
    sluggishness; lethargy.
  2. noun a feeling of lack of interest or energy
    languor; listlessness.
  3. noun weakness characterized by a lack of vitality or energy
    slackness; inanition; lethargy.

WordNet

Las"si*tude noun
Etymology
L. lassitudo, fr. lassus faint, weary; akin to E. late: cf. F. lassitude. See Late.
Definitions
  1. 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.
    The corporeal instruments of action being strained to a high pitch . . . will soon feel a lassitude. Barrow.

Webster 1913