Antonyms for "bring down the house" would involve a lack of excitement or engagement from an audience. Words like "disappoint," "underwhelm," "bore," or "fail to impress" come to mind. These opposites suggest a lack of energy or enthusiasm, as opposed to the highly charged response that "bring down the house" implies. Alternatively, antonyms could imply a sense of quiet or calm, such as "soothe," "ease," or "relax." However, these may not fit the context of a highly charged performance, implying a much different tone and engagement level.