φιλόσπουδος
From LSJ
ἢ δεῖ σιωπᾶν ἢ λέγειν τὰ καίρια → you should either keep silence or make timely remarks (Menander)
English (LSJ)
ον,
A eager, zealous, OGI339.39 (Sestos, ii B. C.), AP5.45 (Phld.).
German (Pape)
[Seite 1286] Eile, Eifer, Ernst liebend, Philodem. 3 (V, 46).