Achillean
adjective
Achil·le·an ¦a-kə-¦lē-ən 
ə-ˈki-lē-
: like Achilles (as in strength, invincibility, or moody and resentful wrath)
Word History
Etymology
Achilles, hero of Homer's Iliad (from Latin, from Greek Achilleus) + English -an
First Known Use
1576, in the meaning defined above