catatonic

adjective

1. having catatonia, a syndrome characterized by muscular rigidity and mental stupor: The schizophrenic remained in a catatonic state.
2. appearing to be in a daze or stupor; unresponsive: She had the catatonic expression of an avant-garde model.

noun

3. a person who suffers from catatonia.

adj.

1899, from catatonia + -ic. As a noun from 1902.