οὐκ ἐθέλειν

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

Source

Greek > English (Woodhouse)

be disinclined, be indisposed to, be unwilling to, refuse to