The phrase "all bases covered" generally refers to the act of being adequately prepared for any potential outcome. Antonyms for this phrase include "not prepared," "unprotected," "exposed," "vulnerable," and "unaware." When an individual or a group is not adequately prepared for a situation, it can lead to problems or failures. Being unprotected means leaving oneself open to attack or criticism. Being vulnerable means lacking the necessary defenses, while being unaware means lacking information about the situation. Therefore, it is important to ensure that all bases are covered in any situation to ensure success and avoid any negative results.