Flabbergasted (adjective)
Syllable division: flab·​ber·​gast·​ed
How to pronounce: US: /ˈflæb.ɚ.ɡæs.tɪd/ UK: \ˈfla-bər-ˌga-stəd \

Meaning: When you are feeling or showing intense shock, surprise, or wonder due to something that happened that you were not expecting. (Completely astonished)

Example:
> The winner just sat there flabbergasted, when they announced his name.
> She was flabbergasted when she found out that her husband cheated on her.
> I was completely flabbergasted when I realised what happened.

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