There are multiple synonyms for the word "brief success" that can be used based on the context and tone of the sentence. Some of these synonyms include momentary victory, fleeting accomplishment, temporary triumph, or short-lived achievement. These phrases can help convey a similar meaning to "brief success," such as a short burst of achievement or a passing moment of accomplishment. It is important to choose the most appropriate synonym based on the intended meaning, as some may have a more positive or negative connotation than others. Overall, incorporating different synonyms into your writing can help make your language more dynamic and engaging.