"languor : (uncountable) A state of the body or mind caused by exhaustion or disease and..."

“languor : (uncountable) 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.
(uncountable) Melancholy caused by lovesickness, sadness, etc.; (countable) an instance of this.
(uncountable) Dullness, sluggishness; lack of vigour; stagnation.
(uncountable) Listless indolence or inactivity, especially if enjoyable or relaxing; dreaminess; (countable) an instance of this.
(uncountable) Heavy humidity and stillness of the air.
(uncountable, obsolete) Sorrow; suffering; also, enfeebling disease or illness; (countable, obsolete) an instance of this.”

- https://en.wiktionary.org/wiki/languor#English

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