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.