DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   failing
       adj 1: below acceptable in performance; "received failing
              grades"
       n 1: a flaw or weak point; "he was quick to point out his wife's
            failings" [syn: failing, weakness]
       2: failure to reach a minimum required performance; "his failing
          the course led to his disqualification"; "he got two flunks
          on his report" [syn: failing, flunk] [ant: pass,
          passing, qualifying]