undumb adjective 1verb 1forms 5 adjective1 •Not dumb (in various senses).Then I did a miracle on myself and came undumb. — 1926 verb1 •to make no longer dumb.One of her earlier bosses said of her: “She gives people a chance to undumb themselves—she asks lots of questions, gives careful feedback, delegates complete tasks with careful instructions. — 1989 formsundumbed · undumbing · undumbs · undumber · undumbest