We say that in English too...i think Shakespeare used it. I wonder if Europeans non-Greek have been saying that since Roman (Latin) times as a kind of fun description.
Popularized by Shakespeare, but predates him as a latin phrase used by scribes:
Graecum est; non legitur, which means “It is Greek and therefore is impossible to read.”Edit: I went back to check and that is not right. Chinese wins out by a lot. I simply misremembered.