Select the most appropriate meaning of the given idiom.

All Greek to me

incomprehensible

The most appropriate meaning of the idiom "all Greek to me" is incomprehensible.

The other options are incorrect.

• "Obvious" does not mean incomprehensible. Something that is obvious is easy to understand.
• "Invisible" does not mean incomprehensible. Something that is invisible cannot be seen.
• "Familiar" does not mean incomprehensible. Something that is familiar is known or understood.

The idiom "all Greek to me" comes from the idea that ancient Greek was a very difficult language for non-Greek speakers to understand. In the same way, something that is all Greek to you is something that you cannot understand. For example, you might say that a technical document is all Greek to you.