ἔργοισι χρηστός, οὐ λόγοις ἔφυν μόνον → a friend in deeds, and not in words alone
P. ἀπερίσκεπτος, ἄσκεπτος, ἀφρόντιστος (Xen.), ἀλόγιστος, P. and V. ἄβουλος, V. δυσλόγιστος; see rash.
daring: P. and V. θρασύς, τολμηρός, P. θαρσαλέος.
off one's guard: P. and V. ἀφύλακτος, ἄφρακτος (Thuc.).