meddler means one who meddles or interferes in something not of their concern. Lexicurio rates it Sui generis — a strength score of 86 out of 100.
meddler is pronounced /ˈmɛdlə(ɹ)/.
Why “meddler” is a great word
MEDDLER — [Noun] One who involves themselves in matters not of their concern, especially in an intrusive or officious manner. From Middle English *medlere*, *medelere*, from *meddle* (to mix, interfere) + the agent suffix *-er*. Unlike an "interloper," who intrudes as an outsider for advantage, or a "busybody," who pries with idle gossip, a meddler interferes from within a familiar sphere, cloaked in a presumption of helpfulness or duty. It is the neighbor realigning your fencepost, the aunt amending your life choices, the committee member seasoning a settled matter with unsought opinion—a portrait of restless agency misplaced, born from the quiet conviction that one's own pattern is the template the world requires.
Etymology
From Middle English medlere, medelere, equivalent to meddle + -er.
noun
- One who meddles or interferes in something not of their concern.“The prudent man is not willing to ſubject himſelf to any responſibility which his duty does not impoſe upon him. He is not a buſtler in buſineſs where he has no concern; is not a meddler in other people’s affairs; is not a profeſſed counſellor or adviſer, who obtrudes his advice where nobody is aſking it.”