wraith
Definitions
A ghost or ghostlike image of someone, especially one seen shortly before or after their death.
Something insubstantial, fleeting, or shadowy.
Examples
A pale wraith drifted silently through the abandoned corridors of the old mansion.
The mountain mist clung to the peaks like a spectral wraith in the moonlight.
He felt a sudden chill as if a wraith had brushed past him in the darkness.