1.Definition: able to survive under unfavorable weather conditions

"Strawberries are hardy and easy to grow", "Camels are tough and hardy creatures"

2.Definition: having rugged physical strength; inured to fatigue or hardships

"Hardy explorers of northern Canada"

Related Adjective(s):stalwart, stout, sturdy

3.Definition: invulnerable to fear or intimidation

Related Adjective(s):audacious, brave, dauntless, fearless, intrepid, unfearing