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Meaning of mind-boggling

mind-bog•gling

Pronunciation: (mīnd'bog"ling), [key]
— adj. Slang.
  1. intellectually overwhelming: a mind-boggling puzzle.
  2. emotionally or psychologically overwhelming; mind-blowing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.