φιλόπρωτος
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
English (LSJ)
ον,
A fond of being first, Plb (?). Fr. (post 29.18) ap.Suid. s.v. πρωτόπειρος, Plu.2.471d, Artem.2.32, etc.; τὸ φ., = φιλοπρωτεία, Plu.Sol.29, Alc.2, etc.