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comparative more strenuous, superlative most strenuous
Having great vigour or energy; forceful. examples
(of a task) Requiring great exertion; very laborious quotations examples
We can achieve this god‐likeness only by unremitting and strenuous effort of the intellect.
1961, J. A. Philip, “Mimesis in the Sophistês of Plato”, in Proceedings and Transactions of the American Philological Association 92, page 467