n, pl  -ties  1 a  :  a deranged state of the mind usu. occurring as a specific disorder (as schizophrenia) and usu. excluding such states as mental retardation, psychoneurosis, and various character disorders  b  :  a mental disorder  2  :  such unsoundness of mind or lack of understanding as prevents one from having the mental capacity required by law to enter into a particular relationship, status, or transaction or as removes one from criminal or civil responsibility .
 
 
 
Similar sounding terms:  in·no·cent  ino·sin·ate 
 
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