understaffed understaffed /ˈʌndɝˌstæft/

adjective

1. Inadequate in number of workers or assistants etc.  ( short-handed , short-staffed , undermanned , understaffed )
   inadequate in number of workers or assistants etc.
    They're rather short-handed at the moment
   they're rather short-handed at the moment
    Overcrowded and understaffed hospitals
   overcrowded and understaffed hospitals