hardy

Synonyms: able able-bodied acclimatized brawny burly capable enduring firm fit fresh hale hardened healthy hearty hefty indefatigable in fine fettle in good condition in good shape inured lusty mighty muscular physically fit powerful resistant robust rugged seasoned solid sound stalwart staunch stout sturdy substantial tenacious unflagging vigorous well

Antonyms: feeble infirm invalid sick tender unhealthy weak