Which term best describes the act of interfering?

The term "meddling" most accurately captures the essence of interfering. Meddling often implies an unwelcome or unnecessary involvement in a situation, particularly where one's presence or input is not warranted. It carries a connotation of intrusiveness, suggesting that someone's interference may complicate matters or create tension.

In contrast, involving can denote participation that may or may not be disruptive, while controlling indicates a take-charge approach that doesn't always align with the idea of unwelcome interference. Disrupting suggests causing an interruption, which may not necessarily imply the kind of indirect or intrusive involvement that meddling entails. Therefore, "meddling" effectively conveys the nuance of unwanted interference.