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adj: sullen is the description of an unenergetic, silently ill-minded, quiet person.

usually this feeling occurs when a person is mad but cannot express his/her feelings properly and fails to communicate with his/her audience, creating an awkward and general feeling of uneasiness
Context: Dillian is mad because Josephina and Mildred pissed him off.

Jospehina: "Dillian what's wrong?"
Dillian: "....... (angry face showing his silently ill-minded mind)"
Mildred: "uhhh are you ok?"
Dillian: ".......(making situation gradually more awkward)"
Geutrude (girl's name): "what's wrong with Dillian?"
Josephina: "uhh i don't know he won't say...."
Dillian: (looks off into the distance, looking very angry, but still failing to describe how he feels)

(As Dillian looks into the distance, Josephina and Mildred leave, awkwardly leaving Geurtrude in silence with Dillian)

In conclusion, Dillian's sullen attitude made the entire situation BAD
sullen by sullenkid2000and10 August 19, 2010
carly is sullen af
sullen by swaglord705 July 31, 2016
A bad-tempered or gloomy person is sullen
he was a very sullen person.

sullen harpy 

A morose teenager who feels just because she is having a hormonal low, or a hangover, or withdrawals, it makes it ok to abuse people.
Nancy, quit being a sullen harpy to your grandma!
sullen harpy by trueboo July 13, 2005

sullen.amv 

"Oh I love sullen.amv!!! The one and only goat of rotos."
sullen.amv by .mistro November 1, 2022

Jester in the Sullen 

A group of people or a person succeeding to make people laugh in a serious session, like an interview, or military training.
That guy was a Jester in the Sullen, he made the whole group laugh!