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Definition of vigorous : 1. Exhibiting strength, either of body or mind; powerful; strong; forcible; energetic; as, vigorous exertions; a vigorous prosecution of a war.
2. Possessing vigor; full of physical or mental strength or active force; strong; lusty; robust; as, a vigorous youth; a vigorous plant.

Synonyms:

quick, able-bodied, persuasive, agile, officious, action, expeditious, supple, prompt, dynamic, red-blooded, restless, driving, iron, busy, dynamical, ready, kinetic, bustling, forcible, effective, strapping, hard-hitting, wide awake, mobile, diligent, nimble, enterprising

hale, chipper, salubrious, hardy, healthy, spry, fit, full-bodied, wholesome

brisk, alert, vital

snappy, forceful, spunky, vivacious, fervid, mighty, effervescent, driven

commanding, controlling, masterful, competent, authoritative

exuberant, emphatic, burning, puissant, earnest, full-blooded, animated, frisky, mettlesome, peppy, lusty, spirited, fervent, zestful, fiery, hearty, agitated, afire, energetic, powerful, prolific, enthusiastic, passionate, zealous, impassioned, zippy, sprightly, strenuous, strong, eager, industrious, virile, potent, lively, active, ardent, excited, ablaze

husky, firm, sturdy, robust, stout, sinewy, formidable, stable, muscular, brawny, tough

Usage examples:

• General Bennigsen would, I believe, have retired early in the day from ground which he ought never to have occupied; but the corps in our front made so vigorous a resistance that, though occasionally we gained a little ground, yet we were never able to drive them from the woods or the village of Heinrichsdorf." - "The Life of Napoleon I (Volumes, 1 and 2)", John Holland Rose.
• " I have certainly noticed," was my answer, " that your modern women seem generally to possess a vigorous development and appearance of power above the waist which were only occasionally seen in our day." - "Equality", Edward Bellamy.
• He was straight and vigorous in spite of the age revealed in his features. - "Joan of Arc of the North Woods", Holman Day.