. dial. What causes luminous watch dials to glow in the dark?. inexcusable. High treason is an inexcusable crime.. apprehension. the student looked around the examination room with apprehension. progression. This week is a long progression of sunny days.. brass. The box is hinged with brass hinges.. contraction. Cold causes contraction of the metal.. impregnable. The President's position is no longer impregnable.. inscription. I've translated the inscription.. nerves. Peter has steady nerves.. etiquette. They have the professional etiquette.. defiance. Act in defiance of orders.