fanatical
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
obstinate: P. and V. αὐθάδης, σκληρός.
mad: P. and V. μανιώδης, Ar. and P. μανικός.
wild: P. and V. βάρβαρος, V. ἀνήμερος.
made savage: P. and V. ἀπηγριωμένος.