Final Answer:
Interloper
Step-by-step explanation:
The synonyms provided—trespasser, meddler, and buttinsky—point towards a term that signifies someone who intrudes or interferes where they're not welcome. "Interloper" aligns closely with these synonyms, describing someone who involves themselves in situations or places where they don't belong or aren't invited.
An interloper is often seen as an unwelcome presence, much like a trespasser who enters restricted areas, a meddler who interferes in others' affairs, or a buttinsky who inserts themselves into situations without invitation. Each term carries a slightly different nuance but converges on the concept of someone intruding or meddling where they're not supposed to.
Using "interloper" encapsulates the idea of an outsider or intruder, capturing the essence of the provided synonyms by describing someone who encroaches upon a space, conversation, or situation, often unwelcomed or uninvited. It's a word that encompasses the negative connotations associated with unauthorized interference or intrusion.