Meaning : A relaxed comfortable feeling.
Synonyms : dreaminess
Meaning : Oppressively still air.
Example :
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.
Meaning : A feeling of lack of interest or energy.
Synonyms : lassitude, listlessness
Meaning : Inactivity. Showing an unusual lack of energy.
Example :
The general appearance of sluggishness alarmed his friends.
Synonyms : flatness, lethargy, phlegm, sluggishness