Synonyms for Sad:

adj.

black (adjective)
depressive, foreboding, distressing, bleak.
bleak (adjective)
hopeless, grim.
cheerless (adjective)
desolate, blue, dull, woeful, sullen, dolorous.
crestfallen (adjective)
discouraged, dispirited, disheartened, cast down.
crying (adjective)
lachrymose, weeping.
dejected (adjective)
dejected, lachrymose, blue, miserable, downhearted, despairing, anguished, glum, anxious, contemplative, disconsolate, dolorous, grim, melancholy, dreary, morose, depressed, disheartened, down, gloomy, mournful, plaintive, joyless, heartbroken, woeful, dispirited, sullen, discouraged, wistful, despondent, overcome, pensive, moody.
depressed (adjective)
despondent, unhappy, low, tristful, melancholic, dysphoric.
depressing (adjective)
dispiriting, bleak.
disappointed (adjective)
crestfallen.
doleful (adjective)
painful, doleful.
funereal (adjective)
funereal.
hopeless (adjective)
hopeless.
inferior (adjective)
low-grade.
moving (adjective)
heart-rending.
pitiful (adjective)
rueful.
regretful (adjective)
rueful.
sad (adjective)
despondent, heart-rending, somber, miserable, lugubrious, disconsolate, dreary, sorry, dejected, gloomy, lachrymose, doleful, down, morbid, Languishing, distressed, unhappy, grievous, troubled, lamentable, deplorable, woebegone, poignant, funereal, weeping, upsetting, heavyhearted, depressing, moving, tragic, dispiriting, bitter, morose, melancholic, sorrowful, mournful, wistful, saddening, downcast, pessimistic, discouraging, low, pitiful, regrettable, heartbroken, forlorn, joyless, glum, bad, melancholy, despairing, pensive, cheerless, oppressive.
second-class (adjective)
second class.
sullen (adjective)
glum.
touching (adjective)
touching, poignant.
woebegone (adjective)
woebegone.

n.

classical, acoustic, funky, funereal, atonal, moving, touching, discordant, poignant, flat, dire, heart-rending, unfortunate, bluesy, oppressive, somber, harmonic, harmonious, bass, disquieting, dispiriting, discouraging. addictive, badass, classy, constitutionally, flexible, babyish, adaptive, Clingy, flawed, born. painful, upsetting, terrible, cheerless. altitude sickness, beriberi, Alzheimer's Disease, anorexia, appendicitis, bronchitis, ague, botulism, regrettable, blood poisoning, grievous, anthrax. humdrum, trivial, unexciting, boring, mind-numbing, uninteresting, tedious, uninspired. bleak, homesick, subdued. inferior (noun)
cheap, common, second class.
sad (noun)
depressing, gloomy, yearning, bad, heavyhearted, pitiful, sorry, pensive, melancholy, mournful, depressive, wistful, lamentable, doleful, deplorable, tragical, melancholic, tragicomic, tragic, distressing, tragicomical, bittersweet, sorrowful, saddening.

Other synonyms:

discouraging, bleak, homesick, upsetting, saturnine, dispiriting. painful, touching, oppressed, cut-up, somber, pessimistic, regrettable, subdued, unfortunate. distressed. terrible, bitter. anxious
careworn.
despairing
hopeless.
despondent
woebegone, brokenhearted.
discouraged
downcast, crestfallen.
dismal
lugubrious.
forlorn
heavy-hearted.
gloomy
cheerless, desolate, heavy.
in low spirits
dysphoric, dull, spiritless, tristful, unhappy, low.
melancholy
funereal.
mournful
grievous.
pathological
morbid.
pensive
Languishing.
sobbing
lamenting.
sorrowful
sorrowful.
sorry
sorry.

Usage examples for sad

  1. Sad reflections on the political and religious state of the country oppressed their minds while travelling through Switzerland. – Memoir and Diary of John Yeardley, Minister of the Gospel by John Yeardley
  2. All is silent, all is sad – Maggie Miller by Mary J. Holmes
  3. I said nothing, but my heart felt sad – The Birthright by Joseph Hocking