extremely irritating, annoying, or trying: a nerve-racking day; a nerve-racking noise.
Also, nerve-wracking.

1805–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To nerve-racking
World English Dictionary
nerve-racking or nerve-wracking
very distressing, exhausting, or harrowing
nerve-wracking or nerve-wracking

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
In this month's column, we'll discuss some strategies for that nerve-racking
Job interviews are nerve-racking enough, but imagine a whole university system
  watching while each question is asked.
It can be nerve-racking even with a rock-solid case.
All of these factors contribute to a nerve-racking job search for applicants
  and interviewers alike.
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