verb[with object] (usually as adjective flabbergasted) • informal
- Surprise (someone) greatly; astonish: this news has left me totally flabbergastedMore example sentences
- Well, I'd just like to say that I'm completely flabbergasted and astounded.
- Brian was flabbergasted, but not really surprised, not on a subconscious level.
- He was flabbergasted at the total complexity of the question.
late 18th century: of unknown origin.