Select the most appropriate meaning of the underlined idiom in the given sentence.

The lecture by the French professor seemed Latin and Greek to the young students.

Incomprehensible

The most appropriate meaning of the underlined idiom in the given sentence is incomprehensible.

The idiom "Latin and Greek" means something that is difficult to understand. It is often used to describe something that is written or spoken in a foreign language, but it can also be used to describe something that is complex or difficult to grasp, even if it is written or spoken in a language that the listener understands.

In the given sentence, the speaker is saying that the lecture by the French professor seemed Latin and Greek to the young students. This means that the students found the lecture very difficult to understand.

The other options are incorrect:

• Interesting: The opposite of incomprehensible.
• Lucid: Easy to understand.
• Unbiased: Not prejudiced or influenced by personal feelings or opinions.