ἔργοισι χρηστός, οὐ λόγοις ἔφυν μόνον → a friend in deeds, and not in words alone
P. ἀλυσιτελῶς (Xen.), P. and V. ἀνόνητα (Plato, Republic and Euripides, Electra 507).
in vain: P. and V. μάτην, ἄλλως, διὰ κενῆς, V. ματαίως, ἄκραντα; see in vain, under vain.