Suitable to, or characteristic of, a master; indicating thorough knowledge or superior skill and power; showing a master's hand; as, a masterly design; a masterly performance; a masterly policy
having or revealing supreme mastery or skill; "a consummate artist"; "consummate skill"; "a masterful speaker"; "masterful technique"; "a masterly performance of the sonata"; "a virtuoso performance"
approval If you describe something as masterly, you admire it because it has been done extremely well or shows the highest level of ability and skill. Malcolm Hebden gives a masterly performance. done or made very skilfully = masterful