|a.||1.||Having no desire or inclination; indifferent; heedless; spiritless.|
|Adj.||1.||listless - lacking zest or vivacity; "he was listless and bored"|
|2.||listless - marked by low spirits; showing no enthusiasm; "a dispirited and divided Party"; "reacted to the crisis with listless resignation"|
|(programming)||listless - 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,
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).