trespasser

If you walk into your kitchen and discover an uninvited neighborhood kid eating your cereal, that kid is a trespasser. A trespasser is someone who enters another person's property without an invitation.

Trespassing is a crime, so a trespasser can find herself in a lot of trouble. As a legal term, trespasser implies that the person has intentionally and knowingly entered private property. So if you trip and fall and find yourself tumbling down a hill into your neighbor's garden, you are not a trespasser. If you stand up, brush yourself off, and enter your neighbor's house to watch their TV, you are a trespasser.

Definitions of trespasser
  1. noun
    someone who intrudes on the privacy or property of another without permission
    synonyms: interloper, intruder
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    types:
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    boarder
    someone who forces their way aboard ship
    crasher, gatecrasher, unwelcome guest
    someone who gets in (to a party) without an invitation or without paying
    infiltrator
    an intruder (as troops) with hostile intent
    encroacher, invader
    someone who enters by force in order to conquer
    penetrator
    an intruder who passes into or through (often by overcoming resistance)
    prowler, sneak, stalker
    someone who prowls or sneaks about; usually with unlawful intentions
    pusher, thruster
    one who intrudes or pushes himself forward
    squatter
    someone who settles on land without right or title
    alien, stranger, unknown
    anyone who does not belong in the environment in which they are found
    foreigner, outsider
    someone who is excluded from or is not a member of a group
    type of:
    persona non grata, unwelcome person
    a person who for some reason is not wanted or welcome
    entrant
    someone who enters
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