incompetent
     adj 1: not qualified or suited for a purpose; "an incompetent
            secret service"; "the filming was hopeless
            incompetent" [ant: {competent}]
     2: showing lack of skill or aptitude; "a bungling workman";
        "did a clumsy job"; "his fumbling attempt to put up a
        shelf" [syn: {bungling}, {clumsy}, {fumbling}]
     3: not doing a good job; "incompetent at chess" [syn: {unskilled}]
     4: not meeting requirements; "unequal to the demands put upon
        him" [syn: {incapable}, {unequal to(p)}]
     n : someone who is not competent to take effective action [syn:
         {incompetent person}]
Source: WordNet® 2.0