Having rugged physical strength; inured to fatigue or hardships.
Impudent.
Able to survive adverse growing conditions.
Brave and resolute.
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.
Having the ability to recover from mental illness, trauma, etc.; having resilience.
Having the ability to absorb energy when deformed.
Returning quickly to original shape after force is applied; elastic.
Returning quickly to normal after damaging events or conditions.