Synonyms for Schizoid:

adj.

demented (adjective)
hysterical, mad, deranged, delirious, lunatic, psycho, maniacal, psychotic, frenzied, unbalanced.
insane (adjective)
mad, nutty, unbalanced, delirious, maniacal, hysterical, psychotic, lunatic, brain-sick, blithering, kooky, demented, babbling, neurotic, insane, deranged, berserk, feverish, frenzied, batty, crazy, Crack-brained, irrational, psycho.
lunatic (adjective)
insane, demented, kooky, nutty, irrational.
off the wall (adjective)
crazy.
pert (adjective)
schizophrenic.

n.

breakdown, combat fatigue, autism, agoraphobia, claustrophobia, delusion, crack-up, dementia, bipolar disorder, Asperger's syndrome. fickle, capricious, mercurial, skittish, flighty. schizoid (noun)
psychoneurotic, neurotic, schizophrenic.

Other synonyms:

capricious, flighty. fickle, mercurial. Other relevant words:
flighty, mercurial, skittish, schizophrenic, breakdown, dementia, autism, delusion, agoraphobia, capricious, psychoneurotic, fickle, crack-up, claustrophobia.