词源不详。可能来自flabby和aghast的合成词。

1. Everybody was flabbergasted when I announced I was going to emigrate to Australia.

我宣布要移民去澳大利亚时，所有人都惊呆了。

来自柯林斯例句

2. Saying that Joan was taken aback is to put it mildly. She was completely flabbergasted.

说琼吃了一惊,这是很保守的说法. 她其实是完全惊呆了.

来自《简明英汉词典》

3. Fourth Master Liu was even more flabbergasted.

刘四爷更没想到事情会弄到了这步天地.

来自汉英文学 - 骆驼祥子

4. I was flabbergasted at the violence of the thunder.

猛烈的雷声使我大吃一惊.

来自辞典例句

5. We both looked at him flabbergasted.

我们两人听了都不禁目瞪口呆地望着他.

来自辞典例句