All Greek to me

Meaningless and incomprehensible like someone who cannot read, speak, or understand any of the Greek language would be

 Origin Shakespeare's Julius Caesar, 1601: originally “But, for my own part, it was all Greek to me”

 Ex: After reading a sign in a foreign language: “well it’s all Greek to me

 Spanish: Me suena como chino



German: böhimiche Dörfer