ἀνερμάτιστος
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 without ballast, ὥσπερ τὰ ἀ. πλοῖα Pl.Tht.144a; unstable, Olymp.in Mete.147.4, cf. Gal.UP2.14. 2 metaph., ἀ. τράπεζα an empty table, Plu.2.704b; unstable, εἶδος Dam.Pr.413; also of persons, without ballast, Ph.2.451, Plu.2.501d, Plot.1.8.8; ἀ. ἐαθέντα τὰ μεγάλα Longin.2.2.