meddler

Etymology

From Middle English medlere, medelere, equivalent to meddle + -er.

noun

1. One who meddles or interferes in something not of their concern.
   “Yes, Mr. Coleman, I have,” answered Luke steadily. “I thought it my duty to inform this man of your character. I have advised him to put his money into a savings-bank.” “Curse you for an impertinent meddler!” said Coleman wrathfully. “I’ll get even with you for this!” “You can do as you please,” said Luke calmly. 1868, Horatio Alger, Struggling Upward
   “Stop!” The hoarse, oddly alien voice of the Swami held a tone beyond all mere earthly fright “I told you there was another form of proof which I could give if necessary, and I warned you not to provoke me to it. This red-faced old meddler is right; I’m not really an East Indian. This face is a mask, and what it covers is not human.” 1934, H. P. Lovecraft, Through the Gates of the Silver Key, chapter 8