snoop

/snuːp/
verb
  1. To secretly look around or investigate someone's private belongings or activities in order to find out information.
    • My little brother tried to snoop in my room while I was out.
    • It's rude to snoop through someone's phone without permission.
    • The reporter snooped around the office looking for evidence of the scandal.
Antonyms
noun
  1. A person who secretly looks into other people's private matters; a nosy person.
    • The security guard caught a snoop trying to peek into the locked files.
    • Our neighbor is such a snoop; she always watches us through the curtains.
    • Don't be a snoop — mind your own business.