IPA: /ræmˈbʌŋkʃəs/
KK: /ræmˈbʌŋkʃəs/
Full of energy and noisy excitement, often in a way that is difficult to control.
The rambunctious children ran around the playground, laughing and shouting.
Rambunctious → The word originates from a combination of the dialectal term 'rambunctious' (possibly derived from 'rambunctious' in the 19th century American English, meaning boisterous or unruly) and the suffix '-ous' (meaning full of). It describes a state of being full of wildness or disorder.
Think of someone being 'full of' ('-ous') wild energy, which is what 'rambunctious' means.