noun
an act of haunting or the state of being haunted
adjective
causing an uneasy or fearful feeling; evoking a sense of dread or unease
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The haunting melody of the violin echoed through the concert hall.
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I can't shake off the haunting feeling that someone is watching me.
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That horror movie was so haunting, it gave me chills.
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The memories of that day still linger in her mind, haunting her dreams.