Relating to or resembling Achilles in character, showing heroic strength, warrior-like determination, or the combination of supreme ability with fatal vulnerability.
From Achilles plus -ean (adjectival suffix). This developed as a literary term to describe the archetype of the mighty warrior with a hidden weakness, central to Greek literary tradition.
Literature teachers love the 'Achillean tragic flaw' concept because it explains why superheroes are actually boring—Achilles only works as a character because of that one weakness, making perfection itself the problem.
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