lacking - definition and synonyms

adjective [never before noun] 

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  1. if something important or useful is lacking, it does not exist or is not available
    sadly/distinctly/noticeably lacking (=completely lacking):

    Concern for passenger safety has, up till now, been sadly lacking.

    lacking in:

    She seems to be totally lacking in common sense.

    be found lacking (=be unable to do what is necessary or expected):

    If someone needed first aid, would you be found lacking?