If you are sad, you feel unhappy, usually because something has happened that you do not like. The relationship had been important to me and its loss left me feeling sad and empty. I'm sad that Julie's marriage is on the verge of splitting up. I'd grown fond of our little house and felt sad to leave it.
Seasonal affective disorder (SAD) is a mood disorder subset in which people who typically have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. [1][2] It is commonly, but not always, associated with the reductions or increases in total daily sunlight hours that occur during the winter or summer. Common symptoms include sleeping too much ...
As an adjective, "sad" primarily refers to feeling or showing unhappiness or sorrow. This is its most common usage, applied to both people and situations. It also describes something that evokes feelings of sadness, such as tragic events or heart-wrenching stories.
feeling unhappiness or grief: to feel sad. expressing or causing sorrow: a sad song. sorry: a sad attempt to make a joke. sad•ly, adv.: She shook her head sadly as she read about the famine. sad (sad), adj., sad•der, sad•dest. sorrowful or mournful: to feel sad because a close friend has moved away.
The word sad has been part of the English language for many centuries but did not mean "unhappy" until the 1300s. In Old English, "sad" meant "satisfied." Later, it came to mean "tired or weary of."
