An intermeddler is someone who interferes without being asked or authorized to do so. The term is negative and generally describes someone who is meddling in the business of others. There are several synonyms for the term, including busybody, meddler, buttinsky, interferer, interloper, and intruder. All of these words have a similar connotation of interfering or meddling, and they are often used to describe people who don't know when to stay out of other people's business. The use of these words is often considered to be rude or impolite, as it implies that the person being described is both nosy and intrusive.