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
νήνεμος, ἐρημαῖος, ἄφθεγκτος, ἄλαλος, ἄφθογγος, ἀκραγής, σιωπηλός, ἀπόφθεγκτος, σιγαλέος, ἀκέων, ἀναύδητος, ἀναύδατος, ἄφωνος, κωφός, σιγαλός, σιγηλός