Boisterous/ˈbɔɪstərəs/ Definition 1 of 2Pro Tip 1/3Human Energy Used to describe people who are lively in a way that can be overwhelming or unrestrained. The party was filled with boisterous laughter and dancing. Pro Tip 2/3Potentially Disruptive Can imply behavior that is so energetic that it could cause disruptions or disturbances. The boisterous fans disrupted the speech. Pro Tip 3/3Informal Settings Best used in casual contexts; may not be appropriate in formal or solemn situations. His boisterous antics were frowned upon at the solemn ceremony.