different between sadness vs dejection

English

From Middle English sadnesse, equivalent to sad +? -ness.

sadness (countable and uncountable, plural sadnesses)

(uncountable) The state or emotion of being sad.
Synonyms: forlornness, melancholy
(countable) An event in one's life that causes sadness.
Synonyms: misfortune, woe

From Old French dejection, from Latin dejectio (“a casting down”).

dejection (countable and uncountable, plural dejections)

A state of melancholy or depression; low spirits, the blues.
The act of humbling or abasing oneself.
- Bishop Pearson
  Adoration implies submission and dejection.
A low condition; weakness; inability.
- Arbuthnot
  a dejection of appetite
(medicine, archaic) Defecation or feces.

(melancholy, depression, low spirits): despondency, downheartedness, crestfallenness
(defecation or feces): excrement, bowel movement

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