What does "vigorous" mean?

Vigorous: Exhibiting strength, either of body or mind; powerful; strong; forcible; energetic; as, vigorous exertions; a vigorous prosecution of a war. The beginnings of confederacies have been always vigorous and successful. Davenant. -- Vig"or*ous*ly, adv. -- Vig"or*ous*ness, n.

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