ἔργοισι χρηστός, οὐ λόγοις ἔφυν μόνον → a friend in deeds, and not in words alone
P. and V. κακῶς, δυστυχῶς.
alarmingly: P. and V. δεινῶς.
dangerously: P. and V. ἐπικινδύνως.