different between sulky vs discontented

English

From sulk +? -y. The horse-drawn vehicle is so called as it obliges the rider to be alone.

sulky (comparative sulkier, superlative sulkiest)

(often derogatory) silent and withdrawn after being upset
- 1865, Lewis Carroll, Alice's Adventures in Wonderland
  The first question of course was, how to get dry again: they had a consultation about this, and after a few minutes it seemed quite natural to Alice to find herself talking familiarly with them, as if she had known them all her life. Indeed, she had quite a long argument with the Lory, who at last turned sulky, and would only say, “I’m older than you, and must know better.” And this Alice would not allow, without knowing how old it was, and, as the Lory positively refused to tell its age, there was no more to be said.
Synonyms: sullen, morose

sulky (plural sulkies)

dis- +? contented

discontented (comparative more discontented, superlative most discontented)

Experiencing discontent, dissatisfaction.
After her injury, Alice was a discontented woman.
Of or pertaining to discontent.
He lived a discontented life.
- 1912, Willa Cather, The Bohemian Girl:
  Clara, like many self-willed and discontented persons, was really very apt, without knowing it, to do as other people told her, and to let her destiny be decided for her by intelligences much below her own.

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