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τὸ ἀφύλακτον

From LSJ

Οὔτοι συνέχθειν, ἀλλὰ συμφιλεῖν ἔφυν → I was not born to hate, but to love.

Sophocles, Antigone, 523

Greek > English (Woodhouse)

being off one's guard, want of precaution, want of vigilance

Spanish

descuido