inexˈcussable, -ible,a.rare—0. [f. in-3 + excussable.] That cannot be shaken out or off. Hence inexˈcussably (-ibly) adv., in an inexcussable manner, so as not to be shaken out. 1816T. L. Peacock Headlong Hall xi, Grasped..firmly and inexcussibly in the hands.