The Collaborative International Dictionary of English v.0.48:

Underhanded \Un"der*hand`ed\, a.
   1. Underhand; clandestine.
      [1913 Webster]

   2. Insufficiently provided with hands or workers;
      short-handed; sparsely populated; obsolete in this sense,
      short-handed or understaffed being the preferrred
      term.
      [1913 Webster +JG]

            Norway . . . might defy the world, . . . but it is
            much underhanded now.                 --Coleridge.
      [1913 Webster]

WordNet (r) 3.0 (2006):

understaffed
    adj 1: inadequate in number of workers or assistants etc.;
           "they're rather short-handed at the moment"; "overcrowded
           and understaffed hospitals" [syn: short-handed, short-
           staffed, undermanned, understaffed]