Etymology
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vigorous (adj.)

c. 1300 (early 13c. as a surname), from Anglo-French vigrus, Old French vigoros "strong, robust, powerful" (12c., Modern French vigoreux), from Medieval Latin vigorosus, from Latin vigere "be lively, flourish, thrive" (see vigor). Related: Vigorously.

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Definitions of vigorous

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