There are many synonyms for the phrase "in a stupor", which is often used to describe a state of being dazed, confused, or disoriented. Some common synonyms include "in a haze", which suggests a lack of clarity or focus, and "in a trance", which implies a kind of hypnotic state. Other synonyms include "in a fog", which can refer to mental confusion, and "in a daze", which suggests a dreamy or unfocused state of mind. Still others might use the term "out of it" or "spaced out" to describe feeling disconnected from reality. Ultimately, the choice of synonym will depend on the context and the desired emphasis.