vigorous

[vig-er-uhs]
adjective
1.
full of or characterized by vigor: a vigorous effort.
2.
strong; active; robust: a vigorous youngster.
3.
energetic; forceful: vigorous steps; a vigorous personality.
4.
powerful in action or effect: vigorous law enforcement.
5.
growing well, as a plant.

Origin:
1300–50; Middle English < Old French < Medieval Latin vigorōsus. See vigor, -ous

vigorously, adverb
vigorousness, noun
overvigorous, adjective
overvigorously, adverb
overvigorousness, noun
supervigorous, adjective
supervigorously, adverb
supervigorousness, noun
unvigorous, adjective
unvigorously, adverb
unvigorousness, noun


2. sturdy, sound, healthy. See active. 3. powerful.


1–5. weak.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vigorous (ˈvɪɡərəs)
 
adj
1.  endowed with bodily or mental strength or vitality; robust
2.  displaying, involving, characterized by, or performed with vigour: vigorous growth
 
'vigorously
 
adv
 
'vigorousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

vigorous
M.E., from Anglo-Fr. vigrus, O.Fr. vigorosus, from L. vigere "be lively, flourish, thrive" (see vigor). Related: Vigorously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Shell said it would vigorously defend itself against both actions.
For that reason, lenders fight vigorously to be put on a college's preferred
  list.
The world's biggest retailer is defying its critics by continuing to grow
  vigorously.
The males vigorously go at it, attacking anything that moves, including other
  males or fluttering leaves.
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