strongly
From LSJ
πολλάκις δοκεῖ τὸ φυλάξαι τἀγαθὰ τοῦ κτήσασθαι χαλεπώτερον εἶναι → it often proves harder to keep than to win prosperity | it is often harder for men to keep the good they have, than it was to obtain it
English > Greek (Woodhouse)
adverb
P. and V. ἐρρωμένως, P. ἰσχυρῶς.
vigorously: P. and V. σφόδρα, κάρτα (Plato but rare P.), μάλα, P. ἰσχυρῶς.
energetically: P. ἐντόνως, συντόνως.
I put the case as strongly as I can: P. ὡς δύναμαι μάλιστα κατατείνας λέγω (Plato, Republic 367B).
urge strongly, verb intransitive: P. ἰσχυρίζεσθαι, διισχυρίζεσθαι.