i Register
In some senses, masterly is marked as derogatory, obsolete, archaic. Watch for register when choosing this word.
adj
Executed in the manner of a master; showing competence and skill; masterful.
Her years of experience enabled her to render a masterly performance.
He made confeſsion of you, / And gaue you ſuch a maſterly report / For art and exerciſe in your defence, / And for your Rapier moſt eſpeciall, / That he cride out t' would be a ſight indeed / If one could match you; [...]
Like a master; arbitrary; domineering, imperious.
The godlie counſels of Salomon and Ieſus the ſonne of Sirach, for ſharpe kepinge in, and bridleinge of youth, are ment rather, for fatherlie correction, then maſterlie beating, rather for maners, than for learninge: for other places, than for ſcholes.
Many times fear is a profitable and an active ſervant, if it do not dominere and grow maſterlie.
adv
In a masterful manner; competently, masterfully.
At length the sound of a flute broke upon mine ear; it was not played masterly, but the tones were very sweet; and what is more correct, perhaps, they harmonized with my feelings.