λύπης ἰατρός ἐστιν ὁ χρηστὸς φίλος → a true friend is grief's physician, a worthy friend is a physician to your pain
ἀκαχμένος, ὀξυπαγής, ὀξύπρῳρος, προήκης, ὀξυβελής, ἀκροπόρος, ἐχεπευκής, ἀκροβελής, πικρός, ὀξύς