melancholia

/ˌmɛlənˈkoʊliə/
noun
  1. A deep, long-lasting sadness or depression, often without a clear cause.
    • The artist's paintings often reflected a quiet melancholia.
    • After the long winter, she felt a sense of melancholia that wouldn't lift.
    • He was diagnosed with melancholia and began therapy.
  2. A historical term for a type of mental illness characterized by extreme sadness and hopelessness, now usually called depression.
    • In the 19th century, melancholia was often treated with rest and fresh air.
    • The patient's melancholia was so severe that he could not get out of bed.
    • Doctors in the past used the word melancholia to describe what we now call clinical depression.
Antonyms
What does "melancholia" mean? | whatsthatwordmean | whatsthatwordmean