masterful
adj.showing great skill or control over something. You use this to describe someone who is an expert at what they do.
adj.demonstrating great skill, proficiency, or authority. Often used to describe an artistic performance or a display of leadership.
“The pianist gave a masterful performance last night.”
“Her masterful handling of the difficult negotiations ensured that both parties left the room satisfied with the outcome.”
“The novelist's masterful use of perspective allows the reader to empathize with even the most morally ambiguous characters throughout the narrative.”
Often used attributively before a noun; can also follow linking verbs like 'be' or 'seem'.
While 'masterly' is a synonym, 'masterful' is more common in modern English to describe a person's high level of skill.