The antonyms for the phrase "covered bases" could be "unprepared," "ill-equipped," or "unready." These terms imply a lack of readiness or attention to detail, suggesting that important elements have been overlooked or left unaddressed. Other antonyms could include "neglected," "omitted," or "skipped," further underscoring the idea that something has been overlooked or ignored. Conversely, antonyms such as "thoroughly addressed" or "comprehensively considered" indicate that all important details or aspects have been taken into account, leaving no room for errors or omissions. Overall, using antonyms for "covered bases" can provide a better understanding of the importance of thorough preparation in any endeavor.