ἑτεροκλινής
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)
ές,
A leaning to one side, uneven, Hp.Art.24; of a building, D.C.57.21; τὰ ἑ. τῶν χωρίων sloping ground, X. Cyn.2.7. Adv. -νῶς one-sidedly, Sor.2.62; ἑ. ἔχειν πρὸς ἡδονήν to have a propensity to it, Arr.Epict.3.12.7.