Definition of "magisterially" [mag•is•te•ri•al•ly]

• In a magisterial manner; authoritatively. (adverb)

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• "He has been described as magisterially presiding over the younger writers, and assuming the distribution of poetical fame; but he who excels has a right to teach, and he whose judgment is incontestable, may, without usurpation, examine and decide."
• "There's Zeus, played by Liam Neeson with a beard best described as magisterially scraggly."
• "It's always a joy to see bad writing get its come-uppance, and Mr Winchester is a 'magisterially' bad writer!"