Sadness is an emotional pain associated with, or characterized by, feelings of disadvantage, loss, despair, grief, helplessness, disappointment and sorrow. An individual experiencing sadness may become quiet or lethargic, and withdraw themselves from others.
sad (third-person singular simple present sads, present participle sadding, simple past and past participle sadded) (transitive, archaic) To make melancholy; to sadden or grieve (someone). quotations
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.
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.
A SAD lamp can help alleviate symptoms of seasonal affective disorder. Learn more about SAD lamps, how to use them, features to look for, and products we recommend.