выражаться загадочно и неясно

From LSJ

Ἢ μὴ ποίει τὸ κρυπτὸν ἢ μόνος ποίει → Aut occulendum nil patra, aut solus patra → Tu nichts Verborgnes oder tue es allein

Menander, Monostichoi, 225

Russian > Greek

αἰνικτὰ κἀσαφῆ λέγειν