The Collaborative International Dictionary
Vigorousness
Vigorous \Vig"or*ous\, a. [Cf. OF. vigoros, F. vigoureux, LL. vigorosus.]
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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.
--Waller. -
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. [1913 Webster] -- Vig"or*ous*ly, adv. -- Vig"or*ous*ness, n.
Wiktionary
vigorousness
n. The quality of being vigorous.