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Adjective: vigorous  vi-gu-rus
  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"

See also: energetic, ripsnorting [N. Amer], robust

Encyclopedia: Vigorous