Synonyms for Psycho:

adj.

crazy (adjective)
batty, berserk, delirious, demented, deranged, insane, kooky, lunatic, maniacal, nutty.
demented (adjective)
frenzied, hysterical, schizoid.
insane (adjective)
babbling, batty, berserk, blithering, crazy, delirious, demented, deranged, feverish, frenzied, hysterical, insane, irrational, kooky, lunatic, mad, maniacal, neurotic, nutty, psychotic, schizoid, unbalanced, Crack-brained, brain-sick.
lunatic (adjective)
madman.
psycho (adjective)
crazed, crazy, loony, mad, psychopathic, psychotic, screwy, unbalanced.

n.

animal, beast, brute, despot, Genghis Khan, monster, ogre, sadist, savage. backward, cabbage, cripple, dwarf, humpback, hunchback, imbecile, madman, madwoman. lunatic (noun)
madman, neurotic.
mad (noun)
crazed, loony, psychopathic, screwy.
mad person (noun)
imbecile.
person (noun)
psychotic, psychotic person.
psycho (noun)
psychotic, psychotic person.

Other synonyms:

despot, Genghis Khan, sadist. monster, ogre. brute. animal, savage. Other relevant words:
animal, backward, beast, brute, cabbage, crazed, cripple, despot, dwarf, humpback, hunchback, imbecile, loony, madman, madwoman, monster, ogre, psychopathic, psychotic person, sadist, savage, screwy.

Usage examples for psycho

  1. On the psycho physical side there is to- day no fully authorised theory. – Schopenhauer by Thomas Whittaker
  2. With the entrance into his world of the new science of psycho analysis he had made now and then small, not very sincere, attempts to penetrate the veil of his own unconscious devising. – The Breaking Point by Mary Roberts Rinehart