strenuous

[stren-yoo-uhs]
adjective
1.
characterized by vigorous exertion, as action, efforts, life, etc.: a strenuous afternoon of hunting.
2.
demanding or requiring vigorous exertion; laborious: To think deeply is a strenuous task.
3.
vigorous, energetic, or zealously active: a strenuous person; a strenuous intellect.

Origin:
1590–1600; < Latin strēnuus; see -ous

strenuously, adverb
strenuousness, strenuosity [stren-yoo-os-i-tee] , noun
quasi-strenuous, adjective
quasi-strenuously, adverb
superstrenuous, adjective
superstrenuously, adverb
superstrenuousness, noun
unstrenuous, adjective
unstrenuously, adverb
unstrenuousness, noun


3. forceful. See active.


2. easy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
strenuous (ˈstrɛnjʊəs)
 
adj
1.  requiring or involving the use of great energy or effort
2.  characterized by great activity, effort, or endeavour
 
[C16: from Latin strēnuus brisk, vigorous]
 
strenuosity
 
n
 
'strenuousness
 
n
 
'strenuously
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

strenuous
"characterized by great effort," 1599, from L. strenuus "active, vigorous, keen." Probably cognate with Gk. strenes, strenos "keen, strong," strenos "arrogance, eager desire," O.E. stierne "hard, severe, keen" (see stern (adj.)). Mocked by Ben Jonson as a pedantic neologism
in "Poetaster" (1601). Sense of "requiring much energy" is first recorded 1671.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Or those with physical disabilities or injuries which make regular strenuous
  exercise difficult or impossible.
In fact, your strenuous efforts at dissuasion could end up reinforcing his
  views.
Strenuous physical activity in adolescents actually seemed to make mind matters
  worse.
The development of critical thinking can be a strenuous undertaking and
  requires all kinds of effort.
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