creepy

Etymology

creep + -y.

adj

1. Moving by creeping along.
   creepy-crawlies
2. (informal) Producing an uneasy fearful sensation, as of things crawling over one's skin.
   creepy ghosts
3. (informal) Causing discomfort or repulsion due to strange or eccentric behaviour.
4. (informal, especially) Causing discomfort through exhibiting sexually inappropriate behaviour.
   That creepy old man keeps leering at me!
   "He doesn't look creepy," I said. "Kind of nerdy, in a harmless way. "Looks can be deceiving. See that camera? He was always going around with that camera, snapping pictures. Some girls caught him trying to get 'up skirt' shots while they sat at their desks.[…]" 2022, Scott Bell, Pest Cemetery, page 235
5. (informal, uncommon) Feeling an uneasy fearful sensation; creeped out.
   “I felt creepy and afraid,” continued the other, with conviction. “I had the sensation of being seen by someone—as if someone, I mean, was watching me. […] 1920, Algernon Blackwood, First Hate