Not much of an answer because the question needs to be rephrased. But there are a few possible answers guessing what the questioner is actually asking. If by "adult world" you mean "adult film", "Greek" or "Greek style" means anal sex.
If you are asking what do people mean by "that's Greek to me", they mean they cannot understand because it is completely foreign and incomprehensible.
ενήλικας (enilikas)
how do you say unite in greek
You can say athlete in Greek by saying athlitis. If you wanted to say the word sports in Greek it would be athlitismos.
In French, you can say "Au revoir" to say goodbye to an adult.
How does one say 'of course' in Greek? Thanks (evkaristo!)
Adult is aikuinen in Finnish.
Ελληνικά (Ellinika) = Greek
How does one say 'of course' in Greek? Thanks (evkaristo!)
You would say "Brandon," as it has no Greek equivalent.
how to say beautiful in greek
point in greek
The Greek word for "About" is "περίπου".