The Collaborative International Dictionary of English v.0.48:

bone-idle \bone-idle\ bone-lazy \bone-lazy\adj.
   1. disinclined to work or exertion.

   Syn: do-nothing(prenominal), faineant, indolent, lazy,
        otiose, shiftless, slothful, workshy, work-shy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bone-idle
    adj 1: constitutionally lazy or idle [syn: bone-idle, bone-
           lazy]