ненадежный
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
Russian > Greek
πλάγιος, ἀμφίβολος, ἄπιστος, ἀνεχέγγυος, ἀσύνθετος, ἀξύνθετος, παλίμβολος, ἀστάθμητος, ἀβέβαιος, κίβδηλος, κίβδαλος, ὀλισθηρός, σφαλερός, μετέωρος