panic struck

/ˈpænɪk ˌstrʌk/
adjective
  1. Overcome with sudden, intense fear or anxiety, often causing an inability to think or act clearly.
    • The hiker became panic-struck after realizing he had lost the trail in the dense fog.
    • The panic-struck crowd rushed toward the exits when the fire alarm went off.
    • She stood panic-struck in the middle of the highway as a truck sped toward her.
Antonyms
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