boggle
bog•gleBrE /ˈbɒɡl/
NAmE /ˈbɑːɡl/
verb
verb forms[intransitive] ~ (at sth) (informal)to be slow to do or accept sth because you are surprised or shocked by it
word origin
Even I boggle at the idea of spending so much money.
sth boggles the ˈmind (also the mind ˈboggles) (informal) if sth boggles the mind or the mind boggles at it, it is so unusual that people find it hard to imagine or acceptThe vastness of space really boggles the mind.‘He says he's married to his cats!’ ‘The mind boggles!’ 
compare mind-boggling
