ἄμωμος
From LSJ
εἰ ἀποκρυπτόντων τῶν Μήδων τὸν ἥλιον ὑπὸ σκιῇ ἔσοιτο πρὸς αὐτοὺς ἡ μάχη καὶ οὐκ ἐν ἡλίῳ → if the Medes hid the sun, the battle would be to them in the shade and not in the sun
English (LSJ)
ον,
A blameless, Semon.4; νόμος Hdt.2.177; without blemish, εἶδος ἄ. Hes.Th.259; κάλλει A.Pers.185; in epitaphs, CIG1974 (Thessalonica), al. 2 unblemished, of victims, etc., LXX Ex.29.1, al., 1 Ep.Pet.1.19, Ph.1.171, al. 3 unimpaired, perfect, ὑγίεια IG5(1).1119 (Geronthrae, iv B. C.).