- (transitive) To thoroughly confuse, befuddle, or bewilder.
1898, Winston Churchill, chapter 2, in The Celebrity:
- I had occasion […] to make a somewhat long business trip to Chicago, and on my return […] I found Farrar awaiting me in the railway station. He smiled his wonted fraction by way of greeting, […], and finally leading me to his buggy, turned and drove out of town. I was completely mystified at such an unusual proceeding.
Solar eclipses continued to mystify ancient humans for thousands of years.
to thoroughly confuse, befuddle or bewilder