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Wordnet 3.0

ADJECTIVE (2)

1. characterized by forceful and energetic action or activity;
- Example: "a vigorous hiker"
- Example: "gave her skirt a vigorous shake"
- Example: "a vigorous campaign"
- Example: "a vigorous foreign policy"
- Example: "vigorous opposition to the war"

2. strong and active physically or mentally;
- Example: "a vigorous old man who spent half of his day on horseback"- W.H.Hudson


The Collaborative International Dictionary of English v.0.48:

Vigorous \Vig"or*ous\, a. [Cf. OF. vigoros, F. vigoureux, LL. vigorosus.] 1. Possessing vigor; full of physical or mental strength or active force; strong; lusty; robust; as, a vigorous youth; a vigorous plant. [1913 Webster] Famed for his valor, young, At sea successful, vigorous and strong. --Waller. [1913 Webster] 2. Exhibiting strength, either of body or mind; powerful; strong; forcible; energetic; as, vigorous exertions; a vigorous prosecution of a war. [1913 Webster] The beginnings of confederacies have been always vigorous and successful. --Davenant. [1913 Webster] -- Vig"or*ous*ly, adv. -- Vig"or*ous*ness, n. [1913 Webster]
WordNet (r) 3.0 (2006):

vigorous adj 1: characterized by forceful and energetic action or activity; "a vigorous hiker"; "gave her skirt a vigorous shake"; "a vigorous campaign"; "a vigorous foreign policy"; "vigorous opposition to the war" 2: strong and active physically or mentally; "a vigorous old man who spent half of his day on horseback"- W.H.Hudson