This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of lack.

adj. inadequate in amount or degree

adj. nonexistent

"Tom gently probed the wound, his expression lacking optimism."

have    surplus    glut   

lacked    lacking    lacks   

fail   

lacklustre   

exclude    want   

blame    fault    crime    offense    deficiency    want    need    destitution    failure   

Adak    Black    Braque    Chirac    Jack    Jacques    Lak    Mac    Mack    Macke   

absence    amount    loss    kind    example    sense    advantage    need    weakness    aspect