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αὐθάδιος

Ἔρως ἀνίκατε μάχαν -> O love, invincible in battle!
Sophocles, Antigone, 781

Spanish (DGE)

-ον
obstinado, recalcitrante ὀργὴν ... κατ' ἀλλήλων αὐθάδιον recalcitrante hostilidad mutua, PLond.1912.80 (I d.C.).