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Hi, what’s the difference between le arif and le edri? They both seem to mean “I don’t know.”

I saw on the net a couple of translations as follows: 1. "I Don't Know!" = La a’ref!; 2. "I Have No Idea." = La adri! I am not sure of the native distinction, as I am just a learner, but when you first asked the question I thought of la adri as something more emphatic like "don't know and can't know" whereas "la arif" is something like "don't know," without any connotation of it being something hard to know. Thanks for the question!