The Collaborative International Dictionary of English v.0.48:
Sad \Sad\ (s[a^]d), a. [Compar. Sadder (s[a^]d"d[~e]r);
superl. Saddest.] [OE. sad sated, tired, satisfied, firm,
steadfast, AS. saed satisfied, sated; akin to D. zat, OS.
sad, G. satt, OHG. sat, Icel. sa[eth]r, saddr, Goth.
sa[thorn]s, Lith. sotus, L. sat, satis, enough, satur sated,
Gr. 'a`menai to satiate, 'a`dnh enough. Cf. Assets, Sate,
Satiate, Satisfy, Satire.]
1. Sated; satisfied; weary; tired. [Obs.]
Yet of that art they can not waxen sad,
For unto them it is a bitter sweet. --Chaucer.
2. Heavy; weighty; ponderous; close; hard. [Obs., except in a
few phrases; as, sad bread.]
His hand, more sad than lump of lead. --Spenser.
Chalky lands are naturally cold and sad. --Mortimer.
3. Dull; grave; dark; somber; -- said of colors. "Sad-colored
Woad, or wade, is used by the dyers to lay the
foundation of all sad colors. --Mortimer.
4. Serious; grave; sober; steadfast; not light or frivolous.
[Obs.] "Ripe and sad courage." --Chaucer.
Lady Catharine, a sad and religious woman. --Bacon.
Which treaty was wisely handled by sad and discrete
counsel of both parties. --Ld. Berners.
5. Affected with grief or unhappiness; cast down with
affliction; downcast; gloomy; mournful.
First were we sad, fearing you would not come;
Now sadder, that you come so unprovided. --Shak.
The angelic guards ascended, mute and sad. --Milton.
6. Afflictive; calamitous; causing sorrow; as, a sad
accident; a sad misfortune.
7. Hence, bad; naughty; troublesome; wicked. [Colloq.] "Sad
tipsy fellows, both of them." --I. Taylor.
Note: Sad is sometimes used in the formation of
self-explaining compounds; as, sad-colored, sad-eyed,
sad-hearted, sad-looking, and the like.
Sad bread, heavy bread. [Scot. & Local, U.S.] --Bartlett.
Syn: Sorrowful; mournful; gloomy; dejected; depressed;
cheerless; downcast; sedate; serious; grave; grievous;