Antonyms for the phrase "being designed for" include "not intended for," "unsuitable for," "ill-suited for," "inappropriate for," and "ill-adapted for." These terms suggest that the intended use of a product or service may not align with its actual effectiveness, usefulness, or suitability for a particular purpose. When something is not designed for a specific use, it may produce undesirable outcomes or unintended consequences. Therefore, it is essential to consider a product or service's intended design and purpose before deciding to use it, as it can affect the overall user experience and satisfaction.