Definitions for lacking
deficient, lacking(p), wanting(p)(adj)
inadequate in amount or degree
"a deficient education"; "deficient in common sense"; "lacking in stamina"; "tested and found wanting"
lacking, absent, missing, wanting(adj)
"the thumb is absent"; "her appetite was lacking"
Kernerman English Learner's Dictionary
in amounts that are too small or do not exist
A community spirit is sadly lacking in this area.; a performance lacking in originality