<p><strong>Adjective</strong></p><ul><li>sturdier, sturdiest</li><li>strongly built; stalwart; robust: sturdy young athletes.</li><li>strong, as in substance, construction, or texture: sturdy walls.</li><li>firm; courageous; indomitable: the sturdy defenders of the Alamo.</li><li>of strong or hardy growth, as a plant.</li></ul><p><strong>Synonyms</strong></p><ul><li>powerful</li><li>strong</li><li>stout</li><li>sinewy</li><li>brawny</li><li>muscular</li><li>hardy</li><li>unconquerable</li><li>determined</li><li>vigorous</li><li>resolute</li></ul><p><strong>Antonyms</strong></p><ul><li>weak</li></ul>