ἀνάγκᾳ δ' οὐδὲ θεοὶ μάχονται → but not even gods fight necessity (Simonides, fr. 37.1.29)
hardly: Ar. and P. σκληρῶς.
securely, firmly: P. and V. βεβαίως, ἀσφαλῶς.
obstinately: Ar. and P. ἀυθάδως, P. σκληρῶς.