ἄκαμνος
From LSJ
νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
English (LSJ)
ον, A unwearied, prob. f.l. for ἀκάμας, PMag.Berol.2.91.
Spanish (DGE)
-ον
incansable, infatigable de Helios Hymn.Mag.11.17 (pap.).