Source : Webster's Revised Unabridged Dictionary (1913)

Disserviceable \Dis*serv"ice*a*ble\, a.
   Calculated to do disservice or harm; not serviceable;
   injurious; harmful; unserviceable. --Shaftesbury. --
   {Dis*serv"ice*a*ble*ness}, n. --Norris. --
   {Dis*serv"ice*a*bly}, adv.