moroseness

This term describes a heavy, brooding quality of sadness that is specifically paired with a lack of social desire. It differs from general sadness or depression by emphasizing the outward manifestation of sullenness and a deliberate, often stubborn, withdrawal from others.

Because it describes a state of being or a quality of character, it is an uncountable noun. It cannot be pluralized or counted as individual units; instead, it is measured in degrees of intensity, often requiring adjectives like deep, profound, or habitual to qualify the extent of the gloom.