spooked

Short definition from Wiktionary

Adjective

1. 1
   A little scared; worried by a feeling or event. Describing the unsettling feeling there being another unknown ghostly presence.
2. 2
   Being spied upon by security or intelligence services.
3. 3
   Taken off guard; astonished; surprised.
4. 4
   Duped into believing a spook.

Verb

1. 1
   simple past and past participle of spook