incompetent person

someone appointed by a court to assume responsibility for the interests of a minor or incompetent person

a stupid incompetent person

n a stupid incompetent person

n a person of subnormal intelligence n a stupid incompetent person

Usually referant to a human being, but can also apply to an inanimate object, such as an obstacular car driven by an ill-willed or incompetent person. > Middle manager, Fudley, was obstacular to my progress up the company ladder