The phrase "gotten one's act together" implies that a person has become more organized, responsible or efficient in their life. Some antonyms of this phrase include "falling apart," "slipping," "losing control," or "coming undone." These words suggest that someone's life may be becoming disorganized, chaotic or dysfunctional. Other antonyms could include "struggling," "faltering," "failing," or "floundering," indicating that someone may be having difficulty in managing their life or responsibilities. Overall, the antonyms of "gotten one's act together" imply a lack of control or stability in a person's life, highlighting the importance of personal organization and responsibility for achieving success.