Antonyms for the phrase "falls flat" would include terms that describe success, excitement, and engagement. A few opposite words that come to mind might include "soars," "thrills," "resonates," "impacts," and "connects." These terms suggest a sense of enthusiasm and momentum, rather than disappointment or disinterest. Other antonyms for "falls flat" might include "hits the mark," "exceeds expectations," "engages the audience," and "ignites the imagination." Ultimately, the antonyms for "falls flat" emphasize the importance of performance, energy, and connection in achieving success and engagement. By focusing on these qualities, one can avoid the pitfalls of lackluster performance and uninspired outcomes.