ἀνεπίφραστος
From LSJ
ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
English (LSJ)
ον,
A unthought of, δύαι Semon.1.21.
German (Pape)
[Seite 225] unbemerkt, unvermuthet, Simon.
Greek (Liddell-Scott)
ἀνεπίφραστος: -ον, ἀπαρατήρητος, ἀπροσδόκητος, δύαι Σιμων. Ἰαμβ. 1. 21.