strenuous

From Latin strenuus (“quick”).

• IPA^(key): /ˈstɹɛnjuəs/
• Hyphenation: stren‧u‧ous

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strenuous (comparative more strenuous, superlative most strenuous)

1. Having great vigour or energy

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

2. (of a task) Requiring great exertion; very laborious
   • 1961: J. A. Philip. Mimesis in the Sophistês of Plato. In: Proceedings and Transactions of the American Philological Association 92. p. 467.

     We can achieve this god‐likeness only by unremitting and strenuous effort of the intellect.

• strenuity
• strenuosity

• strenuous in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• strenuous in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• strenuous at OneLook Dictionary Search