Which term refers to a state of immobility and unresponsiveness lasting for a long period of time?

The term that describes a state of immobility and unresponsiveness lasting for a long period of time is indeed catatonia. This condition is characterized by a marked decrease in reactivity to the environment, where individuals may exhibit a lack of movement, can show rigid postures, or may not respond to external stimuli. Catatonia can occur in various psychiatric disorders, including schizophrenia, and its duration can vary significantly, often requiring clinical intervention.

In contrast, a coma refers to a state of prolonged unconsciousness where an individual cannot be awakened and does not respond to stimuli. While it involves unresponsiveness, it is typically considered a medical emergency with a different set of causes and characteristics than catatonia.

Hypnosis involves an altered state of consciousness and increased suggestibility but is not necessarily characterized by immobility or a long-lasting unresponsive state.

Fainting, or syncope, is a temporary loss of consciousness usually caused by a lack of blood flow to the brain, but it is transient and does not reflect a prolonged state of unresponsiveness. Thus, catatonia is the most accurate term for a long-lasting state of immobility and unresponsiveness.