ῥᾴδιον φθείρειν φαρμακεύσεσιν ἢ ἀποτροπαῖς ἢ καὶ κλοπαῖς → easy to spoil by means of sorcery or diverting or theft
P. and V. ἄβουλος, ἀσύνετος, Ar. and P. ἀνόητος; see foolish.
off one's guard: P. and V. ἀφύλακτος.