stren·u·ous

[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

stren·u·ous·ly, adverb
stren·u·ous·ness, stren·u·os·i·ty [stren-yoo-os-i-tee] , noun
qua·si-stren·u·ous, adjective
qua·si-stren·u·ous·ly, adverb
su·per·stren·u·ous, adjective
su·per·stren·u·ous·ly, adverb
su·per·stren·u·ous·ness, noun
un·stren·u·ous, adjective
un·stren·u·ous·ly, adverb
un·stren·u·ous·ness, noun


3. forceful. See active.


2. easy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Strenuous is always a great word to know.
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a stew of meat, vegetables, potatoes, etc.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
strenuous (ˈstrɛnjʊəs) [Click for IPA pronunciation guide]
 
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.
Estella's subconscious gets a strenuous workout during the course of the film.
It's strenuous, smartly made and ordinary to an extraordinary degree.
From the position now occupied he did not seriously depart throughout the
  strenuous literary work of his mature years.
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