Both Uses
sullen
in
Flags of Our Fathers
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- Now he looked, at times, downright sullen.†
Chpt 4. *
- Sullenly, the young Pima got to his feet and faced the bad news.†
Chpt 16.
Definitions:
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(1)
(sullen as in: a sullen mood) being unhappy (and often withdrawn)
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(2)
(sullen as in: a sullen sky) darkened by clouds; or the color of a gloomy sky
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(3)
(sullen as in: sullen heat) unpleasant
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(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.