What does "it's all Greek to me" mean?

[Hapkido]

informal
I can't understand it at all.
this makes no sense.

[Nur Hayati]

'No, it's all Greek to me.

why is it Greek?

[Beeesneees]

Apparently, it comes from a Medieval Latin proverb “Graecum est; non potest legi” (It is Greek; it cannot be read). Both the Latin and the English meant then just what the phrase does now, to refer to something that is unintelligible.
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Cheers m' dears!

[Wangdingwen]

Why not Latin or Chinese ? :-)

[Beeesneees]

Because the Romans first used the phrase -- about the Greeks. See post #18
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Cheers m' dears!

[Betty76]

Hi! I'm really enjoying the lessons and tests. They are a great way to learn idioms and cultures.
It was interesting for me to learn "it's Greek to me".
If I had had to translate the meaning of this sentence by using an idiom from my native language (Italian), I would have translated it by using Arabic! In Italian we say "è arabo per me" (arabo = Arabic language) when a speaker is saying things we don't understand. Now I know that I must say "Greek" when speaking English :-)

[Namhun]

I got a lot of new expressions in this test.
Thanks.

[Martha0108]

In spanish we say: Me esta hablando en chino?