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intruder

/ənˈtɹudɚ/ · in.tru.d·er
noun
  1. A person who enters a place or situation without permission or invitation. The security guard caught the intruder trying to sneak into the restricted area.
  2. A person who interferes with or disrupts a situation or activity. The new employee was seen as an intruder in the close-knit team, struggling to fit in.
Did you know? The word 'intruder' has been used in various contexts, including literature and film, to describe characters who disrupt the status quo or challenge the norms of a particular society.
Written by Lexi Wordsworth, Dictionary Editor 1 lookups Added Jul 30, 2026