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adj. sad·der, sad·dest
1. Showing, expressing, or feeling sorrow or unhappiness: a sad face.
2. Causing sorrow or gloom; depressing: a sad movie; sad news.
3. Deplorable or inadequate; sorry: a sad state of affairs; a sad excuse.
4. Dark-hued; somber.

[Middle English, weary, sorrowful, from Old English sæd, sated, weary; see sā- in Indo-European roots.]

sad′ly adv.
sad′ness n.
Synonyms: sad, melancholy, sorrowful, doleful, woebegone, desolate
These adjectives mean affected with or marked by unhappiness, as that caused by affliction. Sad is the most general: "Better by far you should forget and smile / Than that you should remember and be sad" (Christina Rossetti).
Melancholy can refer to lingering or habitual somberness or sadness: a melancholy poet's gloomy introspection. Sorrowful applies to emotional pain as that resulting from loss: sorrowful mourners at the funeral. Doleful describes what is mournful or morose: the doleful expression of a reprimanded child. Woebegone suggests grief or wretchedness, especially as reflected in a person's appearance: "His sorrow ... made him look ... haggard and ... woebegone" (George du Maurier).
Desolate applies to one that is beyond consolation: "Now she was desolate, a widow in a foreign country" (Nigel Hamilton).


seasonal affective disorder
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
And the world is sad enough without our writing books to make it sadder. The rest of this book, I promise you, shall be written of a morning.
He went like one that hath been stunned, And is of sense forlorn: A sadder and a wiser man, He rose the morrow morn.
'which are sadder than ever since I have heard of Lord Montbarry's death.
This skeleton of what it had once been was a sad spectacle as it lay lost under the waves, but sadder still was the sight of the bridge, where some corpses, bound with ropes, were still lying.
Stronger it grew and sadder, and deepened into the tone of a death bell, knolling dolefully from some ivy-mantled tower, and bearing tidings of mortality and woe to the cottage, to the hall, and to the solitary wayfarer that all might weep for the doom appointed in turn to them.
The faint, sad voice was fainter and sadder than ever.
When he was gone, he felt more sad and downcast than he cared to own--far sadder than the boy himself, who was happy enough to enter a new career and find companions of his own age.
As we at this place take leave of Tom Loker, we may as well say, that, having lain three weeks at the Quaker dwelling, sick with a rheumatic fever, which set in, in company with his other afflictions, Tom arose from his bed a somewhat sadder and wiser man; and, in place of slave-catching, betook himself to life in one of the new settlements, where his talents developed themselves more happily in trapping bears, wolves, and other inhabitants of the forest, in which he made himself quite a name in the land.
Sadly, sadly, the sun rose; it rose upon no sadder sight than the man of good abilities and good emotions, incapable of their directed exercise, incapable of his own help and his own happiness, sensible of the blight on him, and resigning himself to let it eat him away.
Hadvor now became still sadder than before at the thought of the marriage destined for her, and entreated Olof to think of some plan to save her.
But methinks it must have been sadder still when they were landed on the Long Wharf in Boston, and left to themselves on a foreign strand.
She was sadder than ever as she drove along, and said mournfully, 'I know he has fallen asleep, and will not be able to set me free.' She found him sleeping heavily, and all her efforts to awaken him were of no avail.