Definition of rumbustiously in US English:

rumbustiously

adverb

British
informal
  • See rumbustious

    • ‘I've missed writing about a lovely sunny day, and a rainy day, and a quite rumbustiously stormy night.’
    • ‘This was a rumbustiously motley affair where amateurs would don disguises and curious monikers to run for cash in what is, I believe, the oldest sprint event in the country.’