"hardier" in the adjective sense
1. hardy, stalwart, stout, sturdy
having rugged physical strength inured to fatigue or hardships
"hardy explorers of northern Canada"
"proud of her tall stalwart son"
"stout seamen"
"sturdy young athletes"
2. hardy
able to survive under unfavorable weather conditions
"strawberries are hardy and easy to grow"
"camels are tough and hardy creatures"
3. audacious, brave, dauntless, fearless, hardy, intrepid, unfearing
invulnerable to fear or intimidation
"audacious explorers"
"fearless reporters and photographers"
"intrepid pioneers"
Source: WordNet® (An amazing lexical database of English)
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