"masterly : Executed in the manner of a master; showing competence and skill; masterful. (usually..."

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masterly : Executed in the manner of a master; showing competence and skill; masterful.
(usually derogatory, obsolete) Like a master; arbitrary; domineering, imperious.
masterly adv

(archaic) In a masterful manner; competently, masterfully.

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- https://en.wiktionary.org/wiki/masterly#English

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