Vigorous /(?)/

Vig·or·ous

Vigorous

a.
  1. Possessing vigor; full of physical or mental strength or active force; strong; lusty; robust; as, a vigorous youth; a vigorous plant.
    Famed for his valor, young, At sea successful, vigorous and strong.
  2. 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.