sad

adjective13

1. •
   unhappy, often because something bad has happened

   • She gets sad when he's away.
2. •
   Appearing sorrowful.

   • The puppy had a sad little face.
3. •
   Causing sorrow; lamentable.

   • It's a sad fact that most rapes go unreported.
4. •
   Poor in quality, bad; shameful, deplorable; later, regrettable, poor.

   • That's the saddest-looking pickup truck I've ever seen.
5. •
   (slang) Unfashionable; socially inadequate or undesirable.

   • I can't believe you use drugs; you're so sad!
   • You’d have to be really sad to wear a shirt like that.
6. •
   Emotionally negative.
7. •
   Of colours: dark, deep; later, sombre, dull.

   • […]this is either used crude, and called sulphur vive, and is of a sadder colour; or after depuration, such as we have in magdeleons or rols of a lighter yellow. — 1650
8. •
   (dialect) Soggy (to refer to pastries).
9. •
   (no longer used) Heavy; weighty; ponderous; close; hard.

   • […]his hand, more sad then lomp of lead,[…] — 1590
10. •
    (no longer used) Dignified, serious, grave.

    • Therfore it nedeth that better prouysion. Were founde for youthe by sad and wyse counsayle — 1509
11. •
    (no longer used) Sated, having had one's fill; satisfied, weary.
12. •
    (no longer used) Naughty; troublesome; wicked.
13. •
    (no longer used) Steadfast, valiant.

    • The fearefull newes that whilst the flame doth but begin, Sad pollicie may serue to quench the fire: […] — 1593

exclamation1

1. •
   (Internet, humorous) Expressing contempt, ridicule or disgust; bah!

verb1

1. •
   (no longer used) To make melancholy; to sadden or grieve (someone).

   • 16??, John Webster, Appius and Virginia My father's wondrous pensive, and withal / With a suppress'd rage left his house displeas'd, / And so in post is hurried to the camp: / It sads me much; to expel which melancholy, / I have sent for company.

noun4

1. •
   Initialism of seasonal affective disorder.
2. •
   Initialism of social anxiety disorder.
3. •
   Initialism of standard American diet.
4. •
   Initialism of single-wavelength anomalous dispersion.