mind–bog·gling 
/ˈmaɪndˌbɑ:glɪŋ/ adjective
/ˈmaɪndˌbɑ:glɪŋ/ adjective [more mind–boggling; most mind–boggling] informal : having a very powerful or overwhelming effect on the mind
▪ a mind-boggling [=stunning] performance : amazingly or confusingly large, great, etc. ▪ a mind-boggling array of options ▪ He received a mind-boggling $200 million in pay. ▪ The sheer vastness of space is mind-boggling.
▪ a mind-boggling [=stunning] performance : amazingly or confusingly large, great, etc. ▪ a mind-boggling array of options ▪ He received a mind-boggling $200 million in pay. ▪ The sheer vastness of space is mind-boggling.
— mind–bog·gling·ly adverb
▪ mind-bogglingly large numbers
▪ mind-bogglingly large numbers
