Interloper

[in-ter-loh-per] /ˈɪn tərˌloʊ pər/

noun
1.
a person who interferes or meddles in the affairs of others:
He was an athiest who felt like an interloper in this religious gathering.
2.
a person who intrudes into a region, field, or trade without a proper license.
/ˈɪntəˌləʊpə/
noun
1.
an intruder
2.
a person who introduces himself into professional or social circles where he does not belong
3.
a person who interferes in matters that are not his concern
4.
a person who trades unlawfully
n.

1590s, enterloper, “unauthorized trader trespassing on privileges of chartered companies,” probably a hybrid from inter- “between” + -loper (from landloper “vagabond, adventurer,” also, according to Johnson, “a term of reproach used by seamen of those who pass their lives on shore”); perhaps a dialectal form of leap, or from Middle Dutch loper “runner, rover,” from lopen “to run.” General sense of “self-interested intruder” is from 1630s.

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