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.

something that is incomprehensible or unintelligible to someone

:
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I tried to read the instruction manual, but it's all Greek to me.
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When they started talking about quantum physics, it was all Greek to me.
:
Greekall in allallat allmebe all things to all peopleall singing, all dancing