be struck dumb
to be so surprised by something that you cannot say anything:
We were struck dumb when she announced she was pregnant.
Thesaurus: synonyms and related words
Surprised
- aback
- agape
- aghast
- amazed
- appal
- ghost
- gobsmacked
- goggle-eyed
- headlight
- horror
- horror of horrors idiom
- jaw
- jump/leap out of your skin idiom
- look like/as though you've seen a ghost idiom
- palpitation
- round-eyed
- sb's jaw drops (open) idiom
- shock
- slack-jawed
- staggered
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