The antonyms of being apt would be being inept or unsuitable. Being inept means lacking skill or ability in a particular area, whereas being unsuitable means not appropriate or fitting. These antonyms indicate a lack of preparedness, competence, or relevance for a given task or situation. Being inept could result in mistakes or inefficiencies, while being unsuitable could result in a failure to meet expectations or goals. Depending on the context and circumstances, being apt or its antonyms can have significant implications for personal, professional, or academic success. Therefore, it is essential to recognize and cultivate one's strengths and weaknesses to become more apt and achieve positive outcomes.