εὐπρόσκοπος
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 far-seeing, cautious, τὸ τῶν ἠθῶν εὐκινητότερον καὶ πολυτροπώτερον καὶ -πώτερον Ptol.Tetr.173; cf. ἀπρόσκοπος (B). II easily taking offence, ἀθύμῳ καὶ ἀσθενικῷ καὶ εὐπροσκόπῳ καὶ πρὸς πάντας δυσαρέστῳ ib.207; cf. ἀπρόσκοπος (A).