from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Requiring great effort, energy, or exertion: a strenuous task.
  • adj. Vigorously active; energetic or zealous.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Urgent, ardent, zealous.
  • adj. Requiring great exertion.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Eagerly pressing or urgent; zealous; ardent; earnest; bold; valiant; intrepid.

from The Century Dictionary and Cyclopedia

  • Strong; vigorous; active; pushing.
  • Eagerly pressing or urgent; energetic; zealous; ardent; bold; earnest; valiant; intrepid.
  • Necessitating vigor or energy; accompanied by labor or exertion.
  • Synonyms and Energetic, resolute.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. taxing to the utmost; testing powers of endurance
  • adj. characterized by or performed with much energy or force


From Latin strēnuus.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin strenuus ("quick"). (Wiktionary)



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