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.(adjective)
source: webster1913
adverb (r)
With the skill of a master.(adverb)
source: webster1913
adjective satellite (s)
having or revealing supreme mastery or skill(adj.all)