What's the adjective for Hellenised? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs Hellenise and Hellenize which may be used as adjectives within certain contexts.
Hellenistic
Of or relating to the period of the Greek culture, history, or art after the death of Alexander the Great (323 B.C.) to the defeat of Cleopatra and Mark Antony by Octavian (31 B.C.)--though this end-point is often debated.