adj

• (medicine) Of, relating to, or suffering from catatonia; having a tendency to remain in a rigid state of stupor for long periods which give way to short periods of extreme agitation.
  "However, he was looking a lot more catatonic and depressed before and sometimes we find that on the anti-depressants you remove the depression and uncover the paranoid stuff and we may have to give him larger quantities of tranquilizers just to tone this down."
• (figuratively) Motionless and unresponsive, as from shock; withdrawn.
  "He made Yossarian think of cripples and of cold and hungry men and women, and of all the dumb, passive, devout mothers with catatonic eyes nursing infants outdoors that same night with chilled animal udders bared insensibly to that same raw rain."

noun

• (medicine) A patient in a state of catatonia.
  "An inspection of Table IV shows that the catatonics have the lowest mean reversal score of all the groups."