Being inadequate is a common feeling that everyone experiences at some point in their life. When you feel like you don't measure up to expectations, it can be discouraging and demotivating. However, there are many synonyms that can help you express this feeling. Some of these synonyms include insufficient, inadequate, lacking, deficient, and substandard. Each of these words has a slightly different connotation, but they all relate to feeling like you are falling short. No matter which synonym you choose, it's essential to remember that everyone has moments of inadequacy, and it's important to be kind to yourself and keep pushing forward.