1. a relaxed comfortable feeling
  2. oppressively still air; “the afternoon was hot, quiet, and heavy with languor”; “Summer shows all the languor of a hot, breezeless day as the dancer lazily brushes her hand over her brow”
  3. a feeling of lack of interest or energy
  4. inactivity; showing an unusual lack of energy; “the general appearance of sluggishness alarmed his friends”