imbecile to the fourth power

imbecile to the fourth power: a complete idiot that has no experience or common sense on how to do any work whatsoever; someone who is a nincompute times 4; someone who is incapable of common sense when it comes to work with their hands.

Ross is such an imbecile to the fourth power that he can’t even hang a picture on his wall without making a hole to the outside.

Ross is such an imbecile to the fourth power that he can’t open a sealed package without making a mess everywhere.