Ted İngilizce öğretmekte yetersiz.
 - Ted is incompetent to teach English.
Tom kabiliyetsiz görünüyor.
 - Tom seems incompetent.
Tom tamamen yeteneksizdi.
 - Tom was totally incompetent.
Sekreterim yeteneksizdir.
 - My secretary is incompetent.
Aptal mısın yoksa beceriksiz misin?
 - Are you stupid or incompetent?
Tom beceriksiz görünüyordu.
 - Tom seems to be incompetent.
The charged was judged incompetent to stand trial, at least until his medication started working.
Having an incompetent lawyer may be grounds for a retrial, but the lawyer in question probably doesn't know that.