τίς ἐς σὸν κρᾶτ' ἐπύκτευσεν → who hit you with the fist on the head, who has been pummeling your head
P. and V. ἄβουλος, ἀσύνετος, Ar. and P. ἀνόητος; see foolish.
off one's guard: P. and V. ἀφύλακτος.