<p><strong>Adjective</strong></p><ul><li>characterized by youth; young.</li><li>of, relating to, or befitting youth: youthful enthusiasm.</li><li>having the appearance, freshness, vigor, etc., of youth: She is 60 but her optimism has kept her youthful.</li><li>in an early period of existence; early in time.</li><li>Physical Geography: (of topographical features) having undergone erosion to a slight extent only.</li></ul>