Home › Words › R › rumbustiousnessrumbustiousnessrumbustiousness means synonym of rambunctiousness, the state or condition of being rumbustious, boisterous and unruly.EtymologyFrom rumbustious + -ness.nounSynonym of rambunctiousness, the state or condition of being rumbustious, boisterous and unruly.Definitions & examples from Wiktionary (CC BY-SA 3.0).