Home › Words › R › robustiousnessrobustiousnessrobustiousness means synonym of boisterousness, the quality or state of being robustious, energetic and noisy.Among words judged in Lexicurio's Arena, robustiousness ranks #16,733 of 42,747 for Qualifying.EtymologyFrom robustious + -ness.nounSynonym of boisterousness, the quality or state of being robustious, energetic and noisy.Definitions & examples from Wiktionary (CC BY-SA 3.0).