Antonyms for the word "sound minds" would include words such as erratic, unstable, irrational, and delusional. These words describe individuals who are lacking mental clarity and stability. Someone who is erratic may struggle to maintain consistency in their thoughts and actions, leading to unpredictable behavior. An unstable person may experience extreme emotional highs and lows, making it difficult to maintain a steady and rational mindset. Those who are irrational may exhibit extreme or unreasonable beliefs or reactions to situations. Finally, someone who is delusional may have distorted thinking, perceiving reality in a way that is different from those around them. Opposite of "sound minds," these antonyms describe individuals who may struggle to manage their emotions, thoughts, and behavior in a healthy and constructive way.