it's all Greek to me

US /ɪts ɔl ɡriːk tu mi/
UK /ɪts ɔl ɡriːk tu mi/
"it's all Greek to me" picture
1.

さっぱりわからない, ちんぷんかんぷん

something that is incomprehensible or unintelligible to someone

:
I tried to read the instruction manual, but it's all Greek to me.
取扱説明書を読もうとしたけど、さっぱりわからない
When they started talking about quantum physics, it was all Greek to me.
彼らが量子物理学について話し始めたとき、私にはさっぱりわからなかった