κατάψυχρος
From LSJ
οὕτω τι βαθὺ καὶ μυστηριῶδες ἡ σιγὴ καὶ νηφάλιον, ἡ δὲ μέθη λάλον → silence is something profound and mysterious and sober, but drunkenness chatters
English (LSJ)
ον,
A very cold, Hp.Art.67, S.E.P.1.125, etc.; τόπος Dsc. 2.76; χειμών Gp.1.12.33; of character, Vett.Val.11.32, al.
German (Pape)
[Seite 1393] sehr kalt, S. Emp. pyrrh. 1, 125 u. a. Sp.