necessarily
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 > Greek (Woodhouse)
adverb
P. and V. ἀναγκαίως, P. κατ' ἀνάγκην.
by constraint: P. and V. ἀνάγκῃ, ἐξ ἀνάγκης.