full of stress or tension: the stressful days before a war.

1850–55; stress + -ful

stressfully, adverb
unstressful, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stress (strɛs)
1.  special emphasis or significance attached to something
2.  mental, emotional, or physical strain or tension
3.  emphasis placed upon a syllable by pronouncing it more loudly than those that surround it
4.  such emphasis as part of a regular rhythmic beat in music or poetry
5.  a syllable so emphasized
6.  physics
 a.  force or a system of forces producing deformation or strain
 b.  the force acting per unit area
7.  (tr) to give emphasis or prominence to
8.  (tr) to pronounce (a word or syllable) more loudly than those that surround it
9.  (tr) to subject to stress or strain
10.  informal (intr) to become stressed or anxious
[C14: stresse, shortened from distress]

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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Example sentences
People who know their limitations can plan to avoid stressful situations or to
  work around events that tug at their weaknesses.
It's best and less stressful to begin your driving experience away from big
  cities, so try renting your car in a smaller town.
Fame only made dealing with her mental illness that much more stressful and put
  her under more pressure.
They struggled in stressful situations, often had trouble paying attention, and
  found it difficult to maintain friendships.
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