rumbustious

Concise Oxford English Dictionary © 2008 Oxford University Press:
rumbustious /rʌmˈbʌstʃəs, -tɪəs/

▶adjective informal, chiefly Brit. boisterous or unruly.

– derivatives
rumbustiously adverb,
rumbustiousness noun.

– origin C18: prob. an alt. of archaic robustious ‘boisterous, robust’.