shell-shocked
US /ˈʃel.ʃɑkt/
UK /ˈʃel.ʃɑkt/

1.
suffering from post-traumatic stress disorder as a result of combat experience
:
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The veteran returned home shell-shocked from the war.
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His eyes had a distant, shell-shocked look.
2.
extremely surprised or confused by something unexpected
:
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She was completely shell-shocked by the sudden news of his resignation.
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The audience was left shell-shocked by the twist ending of the movie.