boggle

 
Pronunciation: /ˈbɒg(ə)l/

verb

[no object] informal
  • (of a person or their mind) be astonished or baffled when trying to imagine something: the mind boggles at the spectacle
  • [with object] cause (a person or their mind) to be astonished: the inflated salary of a star boggles the mind
  • (boggle at) (of a person) hesitate to do or accept: you never boggle at plain speaking

Origin:

late 16th century: probably of dialect origin and related to bogle and bogey2