"Fail at" is a commonly used phrase to express one's inability to succeed or accomplish something. However, there exist numerous synonyms that can be used interchangeably with this expression. Instead of "fail at", we can use words like "struggle with", "fall short of", "flounder in" or "lack proficiency in". Another option includes "underachieve", suggesting a failure to reach expectations or potential. Additionally, alternatives such as "come up short", "miss the mark" or "fall through" can be employed to convey a similar meaning. These synonyms serve as suitable alternatives, allowing individuals to effectively communicate their unsuccessful attempts or lack of proficiency without repetitive usage of the phrase "fail at."