Impede :: Impede (v. t.) To hinder; to stop in progress; to obstruct; as, to impede the advance of troops..
Impedible :: Impedible (a.) Capable of being impeded or hindered.
Impediment :: Impediment (n.) That which impedes or hinders progress, motion, activity, or effect..
Impedimental :: Impedimental (a.) Of the nature of an impediment; hindering; obstructing; impeditive.