When it comes to expressing the idea of being sane or having good judgment, the phrase "in the right mind" is commonly used. However, there are several synonyms that can convey the same meaning. One alternative is "of sound mind", which emphasizes the absence of mental illness and the presence of clear thinking. Another option is "rational", which suggests a logical and reasonable approach to decision-making. "Sane" is an additional term that emphasizes mental health and the ability to distinguish between reality and delusion. Lastly, "level-headed" is another synonym that highlights the ability to remain calm and rational in stressful situations.