incompettante

in·com·pet·tante
/inˈkämpəˈtäntē/

noun

1. one who is beyond standard incompetence. Being so incapable such that he/she professes competence or expertise while clearly shitting the bed.

2. one who blames others for their problems in life.

synonyms: dunce, degenerate, bungler, deficient, Reverse Midas Touch, reprobate, ignoramus

Did you hear Joe talking about where the company should invest? He's way off! That incompettante wouldn't know his ass from his elbow.