rambunctious
definition
uncontrollably exuberant; boisterous
example
The rambunctious children filled the playground with laughter and energy as they raced around without a care in the world.
synonyms
unrulyboisterouslively
word origin — The word 'rambunctious' is believed to have originated in the mid-19th century, possibly derived from 'rambunctious' which is thought to be a blend of 'ramp' (to rear up or leap) and 'rebunctious', an alteration of 'rebellious'.