ἐξουσιαστικῶς

From LSJ

τὸ κοῖλον τοῦ ποδὸς δεῖξαιshow the heels, show a clean pair of heels, show the hollow of the foot, run away

Source

Russian (Dvoretsky)

ἐξουσιαστικῶς: самовластно, по свсему произволу Polyb.