All 6 Uses

sullen
in
Cujo
(Auto-generated)

She had put her foot down and it had stayed down, in spite of Joe's sullen mutterings and Brett's wounded eyes.
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sullen = gloomy (demonstrating a bad mood)
Donna, who missed New York badly, was by turns sullen, petulant, and just plain scared.†
His voice was sullen, his face ugly.†
He could have made a decent living doing what New England country people sometimes called 'dog farming', but his temper was not good, and he drove many customers away with his sullenness.†
He was the quintessential back-country Yankee, grunting instead of talking, sullen-faced.†
The heat scared her — it scared her for herself and even more for Tad, what it might he taking out of him — but it didn't scare her as badly as the face of that dog, slavering foam and staring at her with its sullen red eyes.†

Definitions:

(1) (sullen as in: a sullen mood)
being unhappy (and often withdrawn)
(2) (sullen as in: a sullen sky)
darkened by clouds; or the color of a gloomy sky
(3) (sullen as in: sullen heat)
unpleasant
(4) (meaning too rare to warrant focus)
Sullen can also be used figuratively. For example, "A sullen economic landscape" is one that does not look hopeful.