lacking lacking /ˈlækɪŋ/

adjective

1. () Inadequate in amount or degree  ( wanting , deficient , lacking )
   inadequate in amount or degree
    A deficient education
   a deficient education
    Deficient in common sense
   deficient in common sense
    Lacking in stamina
   lacking in stamina
    Tested and found wanting
   tested and found wanting
   
2. Nonexistent  ( absent , lacking , missing , wanting )
   nonexistent
    The thumb is absent
   the thumb is absent
    Her appetite was lacking
   her appetite was lacking