Some antonyms for the phrase "quieted down" could be "noisy," "chaotic," "boisterous," or "disruptive." These words suggest a lack of peace or calmness, often accompanied by loud sounds or movements. The opposite of "quieted down" may also include phrases such as "rampaging," "uproarious," or "riled up," which indicate a state of uncontrollable energy or heightened emotions. Thus, while "quieted down" implies a state of rest or tranquility, its antonyms suggest the opposite, highlighting the importance of language in conveying meaning and nuance.