Adipsia is a medical term that describes a lack or absence of thirst. There are several synonyms for adipsia that can be used in medical literature or conversation. For instance, one synonym is hypodipsia, which refers to a decrease in the sensation of thirst despite normal hydration levels. Another synonymous term used in medical discourse is anhedral, which means being without thirst or having a deficiency in thirst. These synonyms can be helpful in communicating the medical condition of adipsia and discussing related symptoms and treatments. In general, it's essential to use precise language in medical settings to ensure accurate diagnoses, treatments, and discussions amongst professionals.