Mental or Behavioral Dysfunction
depressive disorder
de·pres·sive dis·or·der
Subclass of:
Mood Disorders
Definitions related to depressive disorder:
  • (depression) Frequently experiencing feelings of being down, miserable, and/or hopeless; struggling to recover from these moods; having a pessimistic outlook on the future; feeling a pervasive sense of shame; having a low self-worth; experiencing thoughts of suicide and engaging in suicidal behavior.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • An affective disorder manifested by either a dysphoric mood or loss of interest or pleasure in usual activities. The mood disturbance is prominent and relatively persistent.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Depressive disorders are characterized by sadness severe enough or persistent enough to interfere with function and often by decreased interest or pleasure in activities. Exact cause is unknown but probably involves heredity, changes in neurotransmitter levels, altered neuroendocrine function, and psychosocial factors. Diagnosis is based...
    Merck Manuals
    Merck & Co., Inc., 2025
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