Rambunctious means energetic, noisy, and hard to control in a playful, exuberant way. A rambunctious puppy bounces around the house, knocking things over with its wagging tail. A group of rambunctious kids might shout and chase each other during recess, full of wild energy.

The word captures a particular kind of rowdy behavior: enthusiastic and spirited rather than mean or destructive. A rambunctious classroom before the teacher arrives buzzes with loud conversations and laughter. Rambunctious children at a birthday party might run around shouting with excitement, making it nearly impossible for adults to settle them down.

Notice that rambunctious usually describes behavior that's annoying but not truly bad. A rambunctious younger sibling might drive you crazy by being too loud and energetic, but they're not trying to cause real trouble. The word suggests someone or something overflowing with enthusiasm and energy, even if that energy makes life challenging for everyone else in the room. Parents often tell rambunctious kids to “settle down” or “use your indoor voice,” hoping to channel all that explosive energy in a calmer direction.