It's all Greek to me

It's all Greek to me.

(informal)

something that you say when you do not understand something that is written or said

Usage notes: This phrase comes from Shakespeare's play, Julius Caesar.

I've tried reading the manual but it's all Greek to me.

Name	Pronounced	Usage
Josefina	ho-se-FEE-nah (Spanish), zhoo-zə-FEE-nə (Portuguese), yoo-se-FEE-nah (Swedish)	Spanish, Portuguese, Swedish
Mael	-	Breton
Mu'tasim	-	Arabic
Jaycob	JAY-kəb	English (Rare)
AlastrÍOna	al-as-TREE-na	Irish
Hobson	['hɔbsn]