ἤκιστος
From LSJ
συνετῶν μὲν ἀνδρῶν, πρὶν γενέσθαι τὰ δυσχερῆ, προνοῆσαι ὅπως μὴ γένηται· ἀνδρείων δέ, γενόμενα εὖ θέσθαι → it is the part of prudent men, before difficulties arise, to provide against their arising; and of courageous men to deal with them when they have arisen
English (LSJ)
η, ον, Sup. Adj. of Adv. ἦκα, ἤκιστος ἐλαυνέμεν
A the gentlest or slowest in driving, Il.23.531 (ἥκ- Eust.1314.27, EM424.27; cf. sq.).