παροξυντέον
From LSJ
Τὸ μανθάνειν δ' ἥδιστον εὖ λέγοντος, εἰ κέρδος λέγοι → It is the sweetest thing to learn from one speaking well, if they speak profitably
English (LSJ)
A one must make paroxytone, Poll.1.55.
Greek (Liddell-Scott)
παροξυντέον: ῥημ. ἐπίθετ. τοῦ παροξύνω, δεῖ παροξύνειν, «τρισκαιδεκαέτης, παροξυντέον» Πολυδ. Α΄, 55.