IPA: /rʌmˈbʌstʃəsnəs/
KK: /rʌmˈbʌstʃəsnəs/
The state of being noisy, energetic, and lively, often in a way that is difficult to control.
The children's rumbustiousness filled the playground with laughter and excitement.
Rumbustiousness → It is formed from 'rumbustious' (a variant of 'rumbustious', which is of uncertain origin but possibly derived from 'rumbust', a dialectal variant of 'rumbustious', meaning boisterous or unruly) and '-ness' (meaning the state or quality of). The word 'rumbustiousness' refers to the state of being boisterous or unruly.
Think of the word 'rumbustious' describing someone who is lively and unruly, and remember that adding '-ness' indicates the quality of being that way.