(uncountable) A state of the body or mind caused by exhaustion or disease and characterized by a languid or weary feeling; lassitude; an instance of this.

(uncountable) Melancholy caused by lovesickness, sadness, etc.; an instance of this.

(uncountable) Dullness, sluggishness; lack of vigour; stagnation.

(uncountable) Listless indolence or inactivity, especially if enjoyable or relaxing; dreaminess; an instance of this.

(uncountable) Heavy humidity and stillness of the air.

(intransitive) To languish.