Used with why or when

• when: I must say, my mind does nothing but boggle when comtemplating what goes on inside Widdecombe's head.

Object

• array: In theory, Jose can put out a mind boggling array of different line-ups, all as good as each other.

• fact: Get your brain cells buzzing and discover how the brain works and other mind boggling facts!

• selection: A mind boggling selection of RSS feeds are available, but a list of the best are below.

• statistic: A mind boggling statistic was that the Lord's Prayer or some portion of Scripture had been embossed in 419 languages and dialects.

• imagination: War itself is terrorism on a scale that boggles the imagination.

Modifying Another Word

• really: Mind boggling really, no wonder they have armed guards.

Preposition: at

• thought: The mind boggles at the thought of that rather ascetic pontiff as the Harold Shipman of the Vatican.

Modifying Another Word

• simply: For starters you could say it's the largest darn mall in America, an immense consumer-driven entertainment complex that simply boggles the mind.

• truly: I agree, physics reveals phenomena at which the mind truly boggles.

• slightly: As a practicing Catholic, Blakely then slightly boggles DS Winters by praying over Wells.