clinical depression

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noun
  1. Psychiatry. a depression so severe as to be considered abnormal, either because of no obvious environmental causes, or because the reaction to unfortunate life circumstances is more intense or prolonged than would generally be expected.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for clinical depression

collapse, depression, neurosis, burnout, crackup, neurasthenia, psychotic