When we talk about being good enough for something or someone, it implies a level of performance or accomplishment. However, there are antonyms for this phrase that imply inadequacy or falling short. Some of these antonyms include 'inadequate,' 'unfit,' 'unsatisfactory,' 'inferior,' 'substandard,' 'unacceptable,' 'insufficient,' and 'poor.' These words evoke a negative connotation and can make one feel inadequate or disheartened. However, it's important to remember that these antonyms are often subjective and can vary depending on the context. It's important to strive for excellence, but it's also necessary to recognize that perfection is not achievable, and it's okay to fall short sometimes.