sturdiest

adjective

1. Of firm build; stiff; stout; strong.“a sturdy oak tree”
2. Solid in structure or person.“It was a sturdy building, able to withstand strong winds and cold weather.”
3. Foolishly obstinate or resolute; stubborn.
4. Resolute, in a good sense; or firm, unyielding quality.“a man of sturdy piety or patriotism”