strenuous

comparative more strenuous · superlative most strenuous

1. Having great vigour or energy; forceful.

   strenuous exercise

   1 more example

   strenuous activity

   Synonyms: ardent, earnest, eager, energetic, determined, resolute, vigorous, zealous

2. Requiring great exertion; very laborious.

   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

   2 more examples

   It [Troutbeck] has religious isolation also, for it is several miles—and very strenuous miles in winter—from the parish church at Mungrisdale, and the introduction of the harmonium to the waiting room was due to the zeal of a vicar of many years ago who, in the absence of any other room in the village, obtained permission to use the premises for services, including Sunday School. Most of his successors have continued this self-sacrificing duty.

   1951 October, “Notes and News: The Harmonium at Troutbeck”, in Railway Magazine, page 709

   Whether you need to recover from a stressful day, a strenuous workout or even an injury or surgery, restorative yoga may be just the thing for you.

   2017 February 17, Dana Santas, “Recovering from surgery or stress? Yoga can help”, in CNN