ἀεί ποτ' εὖ μὲν ἀσκός εὖ δὲ θύλακος ἅνθρωπός ἐστι → this guy's always good at being a wineskin, and at times a winesack
lasting: P. and V. χρόνιος.
strong, fierce: P. ἰσχυρός.
hard to resist: P. and V. δύσμαχος, V. δυσπάλαιστος.