The phrase "covering all bases" typically implies the act of being thorough and comprehensive in planning or decision-making. However, its antonyms convey a lack of preparedness or incompleteness, such as "unprepared," "negligent," "improvised," "inadequate," or "incomplete." Failing to cover all bases can lead to unexpected problems or mistakes, such as forgotten details or missed opportunities. Therefore, it is crucial to take the time to consider all possibilities and potential outcomes before making a decision. By doing so, you can ensure that you have covered all bases and are in the best position to succeed.