I've seen too much unhappiness caused by broken marriages
The feeling of not being satisfied or pleased with a situation
residents expressed their unhappiness at the council's decision
sadness: emotions experienced when not in a state of well-being
state characterized by emotions ranging from mild discontentment to deep grief
(unhappy) experiencing or marked by or causing sadness or sorrow or discontent; "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"
(unhappy) dysphoric: generalized feeling of distress
(unhappy) infelicitous: marked by or producing unhappiness; "infelicitous circumstances"; "unhappy caravans, straggling afoot through swamps and canebrakes"- American Guide Series
Depression is a state of low mood and aversion to activity. Depressed people may feel sad, anxious, empty, hopeless, helpless, worthless, guilty, irritable or restless. ...
The feeling of not being happy
(unhappy) Not happy; sad; Not satisfied; unsatisfied; Not lucky; unlucky; Not suitable; unsuitable