Brave and resolute.
Impudent.
Having rugged physical strength; inured to fatigue or hardships.
Able to survive adverse growing conditions.
Anything, especially a plant, that is hardy.
A blacksmith's fuller or chisel, having a square shank for insertion into a square hole in an anvil, called the hardy hole.
Confident and capable.
Walking steadily, without stumbling; capable of finding good footing.