The Collaborative International Dictionary of English v.0.48:

Desidiose \De*sid"i*ose`\, Desidious \De*sid"i*ous\, a. [L.
   desidiosus, fr. desidia a sitting idle, fr. desid?re to sit
   idle; de- + sed?re to sit.]
   Idle; lazy. [Obs.]
   [1913 Webster]