vigorous

Definitions:

Full of physical strength or active force; lusty; energetic; powerful; strong.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Full of strength and life; strong; powerful; forcible.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
VIGOROUSLY.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adverb) (adv.) (adverb)
Vigorousness.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Strong either in mind or body.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
Full of physical and mental strength and energy; full of life; powerful; energetic; strong.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Vigoroualy.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)

Usage examples:

At last she provoked him to a vigorous defense of his views.
- The Iron Trail by Rex Beach
The gum- timber upon it was thick and vigorous it came from the north- westward.
- Australia Twice Traversed, The Romance of Exploration Australia Twice Traversed. The Romance Of Exploration, Being A Narrative Compiled From The Journals Of Five Exploring Expeditions Into And Through Central South Australia, And Western Australia, From 1 by Ernest Giles
I stated in pretty vigorous language that I was a Queen's Messenger, and that if the Chief of Police did not see me instantly he would lose his official head.
- In the Fog by Richard Harding Davis