Modifying an agent noun or its equivalent: who or which performs the specified action with great skill or aptitude; highly accomplished; consummate…

Of a person, etc.: Accomplished either in good or bad things; consummate, excellent, perfect. Const. at, of, in, also to with infinitive. Obsolete.

Having appropriate skill or knowledge (in a particular subject or area); properly trained or experienced; highly skilled.

Of a musical composition, performance, etc.: characterized by or requiring great accomplishment or skill; technically brilliant or difficult. Also…