interloper ( interlopers plural ) If you describe someone as an interloper, you mean that they have come into a situation or a place where they are not wanted or do not belong. n-count
She had no wish to share her father with any outsider and regarded us as interlopers.
Translation English Cobuild Collins Dictionary
gate-crasher (informal) intermeddler, intruder, meddler, trespasser, uninvited guest, unwanted visitor
English Collins Dictionary - English synonyms & Thesaurus
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