(1):
(superl.) Resolute, in a good sense; or firm, unyielding quality; as, a man of sturdy piety or patriotism.
(2):
(superl.) Stiff; stout; strong; as, a sturdy oak.
(3):
(superl.) Foolishly obstinate or resolute; stubborn; unrelenting; unfeeling; stern.
(4):
(n.) A disease in sheep and cattle, marked by great nervousness, or by dullness and stupor.
(5):
(superl.) Characterized by physical strength or force; strong; lusty; violent; as, a sturdy lout.