Strenuous

ahd-5
  • adjective. Requiring great effort, energy, or exertion.
  • adjective. Vigorously active; energetic or zealous.
  • 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.
  • the GNU version of the Collaborative International Dictionary of English
  • adjective. Eagerly pressing or urgent; zealous; ardent; earnest; bold; valiant; intrepid.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adjective. Urgent, ardent, zealous.
  • adjective. Requiring great exertion.
  • 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
  • Word Usage
    "Davutoglu spoke at length about what he described as strenuous efforts by Turkey and Brazil to meet the terms of a letter Obama sent to Erdogan and Brazil's president, outlining the terms of the deal to fuel a research reactor."
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    Herculean  active  ardent  arduous  bold