having or showing little or no interest in anything; languid; spiritless; indifferent: a listless mood; a listless handshake.

1400–50; late Middle English lystles. See list4, -less

listlessly, adverb
listlessness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
listless (ˈlɪstlɪs)
disinclined for any effort or exertion; lacking vigour, enthusiasm, or energy
[C15: from list desire + -less]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Main Entry:  listless1
Part of Speech:  adj
Definition:  having no inclination or spirit; characterized by unwillingingness to exert
Etymology:  Middle English list 'desire' + less's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Word Origin & History

c.1440, from M.E. liste "pleasure, joy, delight," from O.E. lystan, from P.Gmc. *lustijanan "pleasure" (cf. Du. lusten, Ger. lüsten, O.N. lysta), from the same root as O.E. lust "desire" (see lust).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

listless definition

In functional programming, a property of a function which allows it to be combined with other functions in a way that eliminates intermediate data structures, especially lists.
Phil Wadler's thesis gives the conditions for a function to be in listless form: each input list is traversed only once, one element at a time, from left to right. Each output list is generated once, one element at a time, from left to right. No other lists are generated or traversed.
Not all functions can be expressed in listless form (e.g. reverse).
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Integrated search is a boon to listless channel hoppers.
Because they stand out against a backdrop of listless dissatisfaction.
The protesters were listless in the midday furnace of the equatorial sun but
  their message was fierce and clear.
It is not a listless place, and if tourists came here they might spend some
  money and gain a grain of understanding.
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