Definition of: sad

(sad) adjective sad·der, sad·dest
1. Sorrowful or depressed in spirits; expressing, or having the external appearance of grief or sorrow; unhappy; mournful; gloomy.
2. Causing sorrow or pity; distressing; unfortunate.
3. Dial. Heavy; soggy: said of food.
4. Colloq. Vexatious, mischievous, or bad: often humorously or as a mild intensive: That boy is a sad tease.
5. Dark–hued; somber. [OE sæd, orig. sated]
—sad′ly adverb
—sad′ness noun Synonyms: afflicted, dejected, depressed, desolate, despondent, disconsolate, dismal, distressed, doleful, downcast, dreary, dull, gloomy, grave, heavy, lugubrious, melancholy, miserable, mournful, sober, somber, sorrowful, sorry, unhappy, woebegone, woeful. Sad, melancholy, unhappy, and many similar words may be used either of the personal experience of grief, sorrow, mental depression, etc., or of that which causes grief or pain; a person is sad on account of a sad event. See synonyms under BAD. Antonyms: see synonyms for HAPPY.