WordNet sense 1 (the Hellenic branch of the Indo-European family of languages):

Greek, Hellenic language

WordNet sense 2 (of or relating to or characteristic of Greece or the Greeks):

Grecian

WordNet sense 3 (relating to or characteristic of the classical Greek civilization):

Hellenistic, Hellenistical

WordNet sense 4 (characteristic of the ancient Greek and Roman cultures):

Graeco-Roman, Greco-Roman

WordNet sense 5 (of or characteristic of a form or system felt to be of first significance before modern times):

classical