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ἀδιανοήτως

From LSJ

Χρὴ τῶν ἀγαθῶν διακναιομένων πενθεῖν ὅστις χρηστὸς ἀπ' ἀρχῆς νενόμισται → When a good man is hurt, all who would be called good must suffer with him

Euripides, Alcestis, 109-11

Russian (Dvoretsky)

ἀδιανοήτως: неразумно (ἀλογίστως καὶ ἀ. Plat.).

Spanish

sin reflexionar, tontamente