I saw first sentence in dictionary and I wonder if we could consider second one as an alternative: He boggled at the suggestion. He was boggled at the suggestion.
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1The verb boggle can be used with or without an object. The first sentence doesn't have an object. "He boggled." The second sentence is in the passive voice, which usually is used when we want to focus attention on the person or thing affected by something. In the sentence "He was boggled…" the subject "he" is the object (him) in the active sentence: Something boggled him.(active) - He was boggled by… (passive). Therefore I think by is the correct preposition to use here.– re_nezFeb 3, 2019 at 10:37
1 Answer
Both are possible. A person (or their mind) can boggle at something, or be boggled by, or at, something.