How do you say is beautiful in Greek?

The most straightforward way to say "is beautiful" in Greek depends on the gender of the noun being described:

* For masculine nouns: είναι όμορφος (eínai ómorfos)

* For feminine nouns: είναι όμορφη (eínai ómorfi)

* For neuter nouns: είναι όμορφο (eínai ómorfo)

So you'd need to know what you're describing to choose the correct form. "Eínai" means "is," and "ómorfos," "ómorfi," and "ómorfo" are the masculine, feminine, and neuter forms of "beautiful," respectively.