Select the most appropriate meaning of the given idiom. All Greek to…

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.