Antonyms for 'brought down the house' could include phrases such as 'failed to impress', 'fell flat', 'missed the mark', 'left the audience cold', 'flopped', or 'received little applause'. These expressions indicate a lack of success in entertaining or engaging an audience in a live performance. They suggest a level of disappointment or frustration rather than a feeling of excitement or triumph. In contrast to 'brought down the house', these phrases can be used to describe events that lacked energy, creativity, or charisma, or that failed to connect with their intended audience.