mettle /ˈmɛtəl/noun 2adjective 1forms 1 noun2 •A quality of courage and endurance.By this Day and this Light, the fellow ha's mettell enough in his belly. — 1599 •Good temperament and character.Your Master quits you: and for your seruice done him, / So much against the mettle of your sex — 1601 adjective1 •(Scotland) Spirited, vigorous, stout-hearted. formsmettles
