Roscian is an adjective that means related to or skilled at acting.
Quintus Roscius (KWEEN toos RAW shoos) was a famous ancient Roman actor whose skill was so admired that his name became an epithet for any particularly successful or talented actor. Today his name may be used as an adjective for anything related to acting.
In my brief career as an actor, I didn’t have much roscian talent. But I could remember my lines and not bump into the scenery, so I didn’t embarrass myself that much.