griechisch
Greek
Relates to Greece, its culture, its inhabitants, or its language.
Wir haben gestern in einem sehr guten griechischen Restaurant gegessen.
Yesterday we ate at a very good Greek restaurant.

Greek
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Greek
Relates to Greece, its culture, its inhabitants, or its language.
Wir haben gestern in einem sehr guten griechischen Restaurant gegessen.
Yesterday we ate at a very good Greek restaurant.

The adjective 'griechisch' (Greek) is derived from the country name 'Griechenland' (Greece). The ending '-isch' is a typical ending for adjectives that describe origin or affiliation.
Die italienische Küche ist weltberühmt.
Italian cuisine is world-famous.
'Griechisch' (Greek) is often associated with culture and food. Typical combinations are 'griechischer Wein' (Greek wine), 'griechischer Salat' (Greek salad), 'griechische Inseln' (Greek islands), and 'griechische Mythologie' (Greek mythology).
Im Sommer machen wir Urlaub auf einer griechischen Insel.
In the summer, we go on vacation on a Greek island.
When talking about the language itself, the word is capitalized as a noun: 'das Griechische' (the Greek language) or simply 'Griechisch' (Greek). In this form, it does not need declension.
Sie lernt seit einem Jahr Griechisch.
She has been learning Greek for a year.
Roman
'römisch' and 'griechisch' both describe origin, culture, or history, but they refer to different areas. 'römisch' fits with Rome, the ancient Roman Empire, or the present-day city of Rome. 'griechisch' fits with Greece, Greek culture, people from Greece, or the Greek language. Learners may confuse the words because Roman and Greek antiquity often appear together in lessons. The important point is: Rome is 'römisch', Greece is 'griechisch'.

Zu Hause kochen wir heute ein griechisches Gericht mit Feta.
At home, we are cooking a Greek dish with feta today.
Im Museum sieht die Klasse alte römische Münzen.
At the museum, the class sees old Roman coins.