mind-boggling

[mahynd-bog-ling]
adjective Slang.
1.
intellectually overwhelming: a mind-boggling puzzle.
2.
emotionally or psychologically overwhelming; mind-blowing.

Origin:
1960–65

mind-bogglingly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mind-boggling
 
adj
informal astonishing; bewildering

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

mind-boggling
1964; see mind (n.) + boggle.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The comment above displays an absolutely mind boggling degree of lack of
  intelligence and education.
The capacity of people who may be irritated with you to powerfully distort
  reality in academia is mind boggling many times.
If you get the job, be prepared for mind boggling amounts of paperwork double
  and triple marking of student work.
The logistics of this are mind boggling but a start must be made.
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