θεινέμεναι

From LSJ

τὸ δὲ ποιεῖν ἄνευ νοῦ ἃ δοκεῖ καὶ σὺ ὁμολογεῖς κακὸν εἶναι: ἢ οὔ → but doing what one thinks fit without intelligence is—as you yourself admit, do you not?—an evil

Source

French (Bailly abrégé)

inf. prés. épq. de θείνω.

Russian (Dvoretsky)

θεινέμεναι: эп. inf. praes. к θείνω.