This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Showing a brooding ill humor or silent resentment; morose or sulky.

adj. Gloomy or somber in tone, color, or portent: sullen, gray skies.

adj. Sluggish; slow: the sullen current of a canal.

adj. Having a brooding ill temper; sulky.

adj. Dismal; somber.

adj. Sluggish; slow.

adj. Lonely; solitary; desolate.

adj. Gloomy; dismal; foreboding.

adj. Mischievous; malignant; unpropitious.

adj. Gloomily angry and silent; cross; sour; affected with ill humor; morose.

adj. Obstinate; intractable.

adj. Heavy; dull; sluggish.

n. One who is solitary, or lives alone; a hermit.

n. Sullen feelings or manners; sulks; moroseness.

v. To make sullen or sluggish.

Being alone; solitary; lonely; hence, single; unmarried.

Being but one; unique; hence, rare; remarkable.

Remaining alone through ill humor; unsociable; silent and cross; sulky; morose; glum.

Gloomy; dismal; somber.

Sad; sorrowful; melancholy.

Slow-moving; sluggish; dull: as, a sullen pace.

Malignant; unpropitious; foreboding ill; baleful.

Synonyms Gloomy, Sullen, Sulky, Morose, Splenetic. These words are arranged in the order of their intensity and of their degrees of activity toward others. Gloomy has the figurative suggestion of physical gloom or darkness: the gloomy man has little brightness in his mind, or he sees little light ahead. The sullen man is silent because he is sluggishly angry and somewhat bitter, and he repels friendly advances by silence and a lowering aspect rather than by words. The sulky person persists in being sullen beyond all reason and for mere whim: the young are often sulky. In the morose man there is an element of hate, and he meets advances with rudeness or cruel words: the young have rarely development of character enough to be morose. The splenetic man is sulky and peevish, with frequent outbursts of irritation venting itself upon persons or things. Any of these words may indicate either a temporary mood or a strong tendency of nature.

n. A solitary person; a recluse.

n. plural Sullen feelings; sulks; sullenness.

n. A meal for one person.

To make sullen, morose, or sulky.

adj. showing a brooding ill humor

adj. darkened by clouds

"“I am afraid not,” Rysatam replied, his expression sullen."

ill-natured    cloudy   

good-natured    gay    cheerful    vivacious    content    lighthearted    pleased   

petulant    sour    malign    fretful    intractable    peevish    sulky    ill-humored    morose    ill-natured   

Cullen    mullen   

angry    dull    gloomy    surly    restless    haughty    suspicious    morose    resentful    furious