English Dictionary

vampireyness

noun

(informal) The state or quality of being vampirey.

Her vampireyness was evident in her pale skin and sharp fangs.

意味（1）

(informal) The state or quality of being vampirey.

If I remember correctly, the episode $teve's talking about also featured Nick getting caught on camera by a TV news crew, and he was unable to hypnotise her to make her forget because she had physical evidence of his vampireyness.