Ask at the forum if you have an Ancient or Modern Greek query!
Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
heedless: P. and V. ῥᾴθυμος.
off one's guard: P. and V. ἀφύλακτος, ἄφρακτος.
rude: Ar. and P. ἄγροικος; see forgetful.