Sadness n. : Heaviness; firmness.

Sadness n. : Seriousness; gravity; discretion.

Sadness n. : Quality of being sad, or unhappy; gloominess; sorrowfulness; dejection.

Example:
How do I deal with feelings of Sadness and loneliness during the day?

Taxonomy
Sadness, free encyclopedia, pupil size, empathy, emotion, mood, Further reading, small pupils, Harrison, Critchley, HD, grief, Facial expressions, Psychol, search, unclear, lacks, precise citations.

Defination from the web:
sadness as the transfer of a person from a large perfection to a smaller one. Sadness can be viewed as a temporary lowering of mood, whereas depression is characterized by a persistent and intense lowered mood, as well as ...