it's all Greek to me

IPA(Pronunciation)

Phrase

idiomatic

(idiomatic) I don't understand any of it; it makes no sense.

Japanese Meaning

（イディオム）全く理解できない、意味が通じない / （慣用句）内容が全く分からず、手に負えない状態

When the professor started explaining the quantum equations, I whispered to my neighbor, "it's all Greek to me."

教授が量子の方程式を説明し始めたとき、私は隣の席の人に小声で「さっぱり分からない」と囁いた。

Sense（1）

(idiomatic) I don't understand any of it; it makes no sense.

I tried reading the instructions, but it’s all Greek to me.