expression, i-adjective
well-versed in; profoundly knowledgeable about
Fixed expression used with に to indicate deep expertise or extensive knowledge in a field. Often appears as ～に造詣が深い.
彼は日本文学に造詣が深い。
He is well-versed in Japanese literature.
田中教授は経済学に造詣
Professor Tanaka is known for being profoundly knowledgeable about economics.