Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
ἀρχέπολις, πιστός, ἀξιόχρεως, παραμόνιμος, παρμόνιμος, ἀξιόπιστος, βέβαιος, ἰσχυρός, ἄρκιος, ἀσφαλής, νημερτής, μόνιμος, ἄλυτος, ἐμβριθής, ἐχυρός, φερέγγυος, σαφής