sadness
1. [ noun ] emotions experienced when not in a state of well-being
Synonyms: unhappiness
Related terms: happiness feeling sorrow melancholy sorrow depression forlornness cheerlessness downheartedness misery weepiness dolefulness
2. [ noun ] the state of being sad
Synonyms: sorrowfulness sorrow
Examples:

"she tired of his perpetual sadness"

Related terms: unhappiness mourning poignance grieve