conversant
/kənˈvəːs(ə)nt/
adjective
predicative Familiar with or knowledgeable about something.
Origin
Middle English: from Old French, present participle of converser (see converse). The original sense was ‘habitually spending time in a particular place or with a particular person’.
The young wizard was surprisingly conversant with his trade, casting spells as easily as a veteran fisherman casts dry flies.