The state of being listless; indifference; lethargy.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "listlessness" in a sentence
"Robert Southey to Horace Walpole Bedford, 12 November 1794 * There was a time Horace when my life was heavy in listlessness — when I lookd forward & all was darkness without one ray to which I might guide my steps. strange alteration! now my soul never rests. in the tumult of emotion I have neglected to thank you for Piers Plowman  — or if I did thank you, have forgotten it."
"Do not believe that these observations, which are as true as they are wittily stated, contradict in any way the system which we have previously prescribed; by the latter, as by the former, we succeed in producing in a woman that needed listlessness, which is the pledge of repose and tranquility."
"The techs were going through the motions, but there was a kind of listlessness in their movements and a general air of defeat."