deficiency

deficiency (http://definr.com/deficiency)

     n 1: the state of needing something that is absent or
          unavailable; "there is a serious lack of insight into
          the problem"; "water is the critical deficiency in
          desert regions"; "for want of a nail the shoe was lost"
          [syn: lack, want]
     2: lack of an adequate quantity or number; "the inadequacy of
        unemployment benefits" [syn: insufficiency, inadequacy]
        [ant: sufficiency, sufficiency]