In`ad·vert'ent adjective [ Confer French inadvertant . See 2d In- , and Advert .] Not turning the mind to a matter; heedless; careless; negligent; inattentive. « An inadvertent step may crush the snail That crawls at evening in the public path.» Cowper.... Found on http://www.encyclo.co.uk/webster/I/27