неудержимо
From LSJ
τὸ λακωνίζειν πολὺ μᾶλλόν ἐστιν φιλοσοφεῖν ἢ φιλογυμναστεῖν → to behave like a Lacedaemonian is much more to love wisdom than to love gymnastics (Plato, Protagoras 342e6)
Russian > Greek
ἐπιρροίβδην, ἀκατασχέτως, ἀσχέτως, ἀνεπισχέτως, ἀνέδην, σοβαρῶς