listless (adj.)

"to be pleased, desire" (intransitive), a sense now archaic, mid-12c., lusten, listen "to please, desire," from Old English lystan "to please, cause pleasure or desire, provoke longing," from Proto-Germanic *lustjan (source also of Old Saxon lustian, Dutch lusten "to like, fancy," Old High German lusten, German lüsten, Old Norse lysta "desire, wish, have a fancy"), from *lustuz-, from PIE root *las- "to be eager, wanton, or unruly" (see lust (n.)). Related: Listed; listing.

word-forming element meaning "lacking, cannot be, does not," from Old English -leas, from leas "free (from), devoid (of), false, feigned," from Proto-Germanic *lausaz (cognates: Dutch -loos, German -los "-less," Old Norse lauss "loose, free, vacant, dissolute," Middle Dutch los, German los "loose, free," Gothic laus "empty, vain"), from PIE root *leu- "to loosen, divide, cut apart." Related to loose and lease.