barythymia

Etymology
From +.

Noun

 * 1)  A depressed state of mind.
 * 2) * 1810, John Jackson, Barythymia (poem): referenced in Halkett, Dictionary of Anonymous and Pseudonymous English Literature

Usage notes
This word is found far more often in medical dictionaries than in actual use, and melancholy or depression are generally better alternatives.

Related terms

 * athymia
 * dysthymia