There are several synonyms for the term "without vital functions," which refers to a state of being devoid of the basic signs of life such as breathing, heartbeat, and brain activity. One of the common synonyms for this condition is "clinically dead." Other synonyms include "lifeless," "inanimate," "vegetative," and "unresponsive." These words can be used to describe individuals who are in a state of complete absence of life signs, and they can be used in a medical or general context. It's essential to note that the correct term must be used to avoid confusion and ensure proper communication in various settings, including emergency care and medical situations.