Masterly

a.	1.	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.
	2.	Imperious; domineering; arbitrary.
adv.	1.	With the skill of a master. Thou dost speak masterly. - Shak.

Adj.

1.

masterly - 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" Synonyms: consummate, masterful, virtuoso

consummate, masterful, skilled, virtuoso