What term is used for behavior that involves playful, mischievous, and sometimes noisy actions?

The term "obstreperous" specifically describes behavior that is noisy, unruly, and prone to disruption, often in a playful or mischievous manner. When someone is described as obstreperous, it conveys a sense of spiritedness and boisterousness, indicating a lively, sometimes disruptive presence.

This word captures the essence of actions that are not just fun and playful but also lack restraint, making it fitting to describe mischievous behavior. The vivid connotation of obstreperousness aligns well with actions that might draw attention due to their raucousness or lack of decorum.

In contrasting terms, "timorous" suggests fearfulness or timidity, "tranquil" evokes calmness and peacefulness, and "reserved" describes someone who is restrained and holds back their emotions. These alternatives do not convey the lively, noisy, and playful nature inherent in the concept of obstreperous behavior. Thus, the selection of this term is clearly the most appropriate given the context of the question.