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.

adamantine athletic beefy bouncing brawny bulky burly dense determined doughty durable enduring firm firm as Gibraltar flush forceful forcible forcy full-blooded full-strength gutsy gutty hale hale and hearty hard hard as nails hardy hearty heavy hefty husky indomitable infrangible iron-hard lasting lusty made of iron massive mighty muscular nervy obstinate potent powerful puissant red-blooded resolute rigid robust robustious robustuous rude rugged solid sound stable stalwart staunch steadfast steady steely stout strapping strong strong as brandy strong as strong strong-willed substantial tenacious tough unbreakable uncompromising unfaltering unswerving unwavering unyielding vigorous vital well-built well-constructed well-founded well-grounded well-made