Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
incompetent [ɪnˈkɔmpɪtnt] adj (person) некомпете́нтный*некомпете́нтен (work) неуме́лый/неуме́л
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: