chemically imbalanced vs psycho

chemically imbalanced

• Mentally ill. 

• Used other than figuratively or idiomatically: see chemically, imbalanced. 

psycho

• Psychotic or otherwise insane. 

• A person who acts in a bizarre or dangerous manner. 

• A class, at a college or university, in which psychology is taught. 

• A person who is psychotic or otherwise insane.