There are numerous synonyms for the phrase "perform poorly" which can be used to express the same meaning in different ways. Some of the common alternatives include "underperform", "fall short", "disappoint", "mismanage", "botch", "flop", "flounder", "stumble", and "fail to meet expectations". Each of these terms conveys a sense of inadequate or unsatisfactory performance, highlighting a lack of competence, skill, or preparation. These synonyms can be particularly useful in various contexts such as academic performance, work evaluations, or sports activities. By using such phrases to describe poor performance, individuals can provide constructive feedback and encourage improvement.