nonplussedadjective
uk/ˌnɒnˈplʌst/us/ˌnɑːnˈplʌst/surprised, confused, and not certain how to react:
I was completely nonplussed by his reply.
Thesaurus: synonyms and related words
Surprised
- aback
- agape
- aghast
- amazed
- appal
- flabbergast
- ghost
- gobsmacked
- goggle-eyed
- headlight
- horror
- horror of horrors idiom
- jaw
- jump/leap out of your skin idiom
- palpitation
- round-eyed
- sb's jaw drops (open) idiom
- shock
- slack-jawed
- staggered
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You can also find related words, phrases, and synonyms in the topics:
Doubt & ambivalence