1. (superl.) Foolishly obstinate or resolute; stubborn; unrelenting; unfeeling; stern.

2. (superl.) Resolute, in a good sense; or firm, unyielding quality; as, a man of sturdy piety or patriotism.

3. (superl.) Characterized by physical strength or force; strong; lusty; violent; as, a sturdy lout.

4. (superl.) Stiff; stout; strong; as, a sturdy oak.

5. (n.) A disease in sheep and cattle, marked by great nervousness, or by dullness and stupor.