mind-boggling
informal
1. Extremely hard to understand; very confusing. Susan hasn't seen her son in 15 years. It is just mind-boggling to me how anyone could cut their mother out of their life like that. I don't think I'm cut out for advanced calculus. These equations are mind-boggling to look at.
2. Staggering; surprising. Hollywood now churns out huge blockbuster movies at a mind-boggling pace. The camera on this fancy new smartphone is mind-boggling. I mean, look at all the detail on that flower petal!
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