hear it again

: a sad or gloomy mood or condition

Example sentence:
Carolina's excitement about moving was tinged with melancholy because she knew she would have to leave many friends behind.

Etymology:
"Melancholy" is a humorous word—that's "humorous" in the sense of the bodily humors, the fluids people once thought controlled human personalities and emotions. People believed "black bile," which was supposedly a humor made and released by the kidneys and spleen, caused people to feel depressed and sulky. In fact, the word "melancholy" traces back to the ancient Greek terms "melan-," meaning "black," and "cholos," meaning "bile." Nowadays, folks know that moods aren't controlled by humors, but they still use the word "melancholy" for blue moods.