sullenly is a form of:

Sullen



adjective
1.
(Gloomy and unresponsive from resentment or bad temper, dark and dismal gloomy, somber, dull, sad, sluggish) ដែលក្រញែក្រញូវហើយមិនមាត់ក​ដោយមិនស្រួលចិត្ដ, ដែលក្រញូវ, អួរ, ដែលស្រពាប់ស្រពោន, ដែលក្រាញ, កៀច, ពិបាកដឹកនាំ, ដែលពិបាកបញ្ចុះបញ្ចូល
Example: A sullen look, A sultry day is one that is hot and moist, with very little breeze, the sullen winter skies.
Example: All my attempts to amuse the children were met with sullen scowls.
ENGLISH MEANING
noun
1.
One who is solitary, or lives alone; a hermit.
2.
Sullen feelings or manners; sulks; moroseness; as, to have the sullens.
adjective
1.
Heavy; dull; sluggish.
2.
Lonely; solitary; desolate.
3.
Gloomy; dismal; foreboding.
4.
Mischievous; malignant; unpropitious.
5.
Gloomily angry and silent; cross; sour; affected with ill humor; morose.
verb
1.
(TRANSITIVE) To make sullen or sluggish.
1.
dour, fretful, gloomy, glum, moody, morose, sulky, surly
1.
amiable, gay, joyous, merry, pleasant
1.
Obstinate, intractable