unhappiness
//ʌnˈhæp.i.nəs//
Noun
unhappinessSingular
1
The state or condition of not being happy; a feeling of sadness, sorrow, or discontent.
She couldn't hide her unhappiness after hearing the bad news.
2
A cause or source of sadness or dissatisfaction.
Money problems were a major unhappiness in their marriage.