σιωπηλόν

From LSJ

κακῷ δέ τῳ προσεικάζω τάδε → I think this looks like mischief, these things sound ominous to me, these things sound evil to me, I consider these things ominous, I liken these things to something bad

Source

Russian (Dvoretsky)

σιωπηλόν: τό
1 молчание, безмолвие, тишь (τῆς ἐρημίας Plut.);
2 молчаливость (sc. Φαβίου Μαξίμου Plut.).