BOISTEROUS Meaning of BOISTEROUS in English adj.1 (of a person) rough; noisily exuberant. 2 (of the sea, weather, etc.) stormy, rough. Derivatives: boisterously adv. boisterousness n. Etymology: var. of ME boist(u)ous, of unkn. orig. Oxford English vocab. Оксфордский английский словарь. 2012