необдуманно
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
Russian > Greek
ἀβούλως, ῥᾳδίως, ῥηϊδίως, προχείρως, εἰκῇ, εἰκῆ, ἀνεπιστάτως, ἀπερισκέπτως, ἀπρονοήτως, ἀπροβούλως, ἀσκέπτως, ἀσκόπως, ἀφροντίστως, ἀνεπιλογίστως, ἐμπλήκτως, ἀκρίτως