Mental or Behavioral Dysfunction
delusional disorder
de·lu·sion·al dis·or·der
Definitions related to delusional disorder:
  • A disorder characterized by the presence of one or more nonbizarre delusions that persist for at least 1 month; the delusion(s) are not due to schizophrenia or a mood disorder, and do not impair psychosocial functioning apart from the ramifications of the delusion(s).
    NCI
    U.S. National Cancer Institute, 2021
  • Disorder with presentation of a facade of coldness with characteristic pervasive mistrust and suspiciousness of others.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Delusional disorder is characterized by firmly held false beliefs (delusions) that persist for at least 1 month, without other symptoms of psychosis.
    Merck Manuals
    Merck & Co., Inc., 2025
  • Delusional disorder is an illness characterized by at least 1 month of delusions but no other psychotic symptoms according to the American Psychiatric Association�s Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). Delusions are false beliefs based on incorrect inference about external reality that persist...
    Medscape
    WebMD, 2025
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