creepy
adjective informal
UK /ˈkriː.pi/ US /ˈkriː.pi/

• strange or unnatural and making you feel frightened:
- a creepy film
- a creepy smile

• unpleasant and making you feel uncomfortable, especially because of sexual behaviour that is not wanted or not appropriate:
- She got pestered by a creepy cab driver.
- In our culture, a friendship between an 11-year-old girl and a 36-year-old man is considered creepy.