Having one's act together is a popular phrase that is used when someone has everything under control or is well-prepared for a situation. However, the opposite of having one's act together implies chaos, disorganization, and a lack of preparation. Some antonyms for this phrase include being unprepared, disordered, incompetent, inept, unqualified, unprofessional, and unskilled. These negative traits can lead to poor performance, missed deadlines, and ineffective results. Therefore, it is important to always strive to have one's act together and to avoid the antonyms that can hinder personal and professional success.