εὐθυμάχος
From LSJ
ὁ κόσμος ἀλλοίωσις, ὁ βίος ὑπόληψις → the universe is flux, life is opinion | the universe is transformation: life is opinion | the universe is change, life is a fleeting impression | the universe—mutation: life—opinion
German (Pape)
[Seite 1070] = εὐθυμάχης, ἄνδρες Simon. 18 (VI, 442); π ολιῆται 30 (App. 73).
Greek (Liddell-Scott)
εὐθυμάχος: ᾰ, ον, = εὐθυμάχης, Σιμωνίδ. 108, Ἀνθ. Π. παράρτ. 73.