a relaxed comfortable feeling
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"
a feeling of lack of interest or energy
inactivity; showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
A state of the body or mind caused by exhaustion or disease and characterized by a languid or weary feeling; lassitude; (countable) an instance of this.
To languish.