Mind-boggling

The sum of the ignorance of the Republican candidates in the primaries for the U.S. presidential election is simply mind-boggling: one is afraid that China will obtain nuclear weapons, which they have had for 44 years, and the other proposes to close the U.S. embassy in Iran, which has been closed for 32 years... Such stupidity at the head of the world's most powerful country gives one the shivers!

Tom's story is mind-boggling.

Selecting a college or university from the thousands in the U.S. can be mind-boggling.

It's kind of mind-boggling.

Faced with a mind-boggling selection of special-purpose shampoos, he gave up and simply purchased something inexpensive with a pleasant fragrance.

Concurrent with the development of these techniques is the proliferation of large computers able to manipulate massive data sets with mind-boggling ease.

[S]ince the end of September, the average daily unemployment claims for Florida have risen by 55 percent, translating into approximately 50,000 more Floridians applying for unemployment benefits. That is mind-boggling. That is staggering.

Davie opened his eyes but had no idea where he was or if in fact he was still alive. After the realization of lying in his truck bunk had taken hold, he quickly turned to see if he'd dreamt up the whole mindboggling affair and by the grace of God was still parked in Wales.

Ever since I was young, whenever something involving arithmetic came along, friends and even grown-ups would say, "Oh just give the math to Mary." Before long, my nickname had become Ms. Mary Math. And today, I'm the go-to wiz for mind-boggling math questions.

Chief among the dire presentiments was the suggestion that the ascension of Labour to power would result in Radiohead ceasing touring and instead taking up a residency at a Las Vegas resort. The image of Thom Yorke serenading Sin City’s high rollers with a rousing chorus of Pulk/Pull Revolving Doors was mind-boggling, but you could see why some press went on the offensive.