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
Our philosophy is that vigorous and respectful adventure travel can help
  sustain and repair a region.
But he was vigorous in defense of his bower and belongings, and flew at them
  with beak and tongue out, claws ready to strike.
Yet the company's official response to all this activity has gone from
  hostility to acceptance to vigorous support.
When the wind is low, steam plumes from the vigorous fumaroles can be seen in
  the nearby valleys.
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