Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Requiring great effort, energy, or exertion.
  • adjective Vigorously active; energetic or zealous.

from The Century Dictionary.

  • 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 the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

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

[From Latin strēnuus.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin strenuus ("quick").

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