sullen

1 ENTRIES FOUND:
sullen /ˈsʌlən/ adjective
sullen
/ˈsʌlən/
adjective
Britannica Dictionary definition of SULLEN
[more sullen; most sullen]
1 
— used to describe an angry or unhappy person who does not want to talk, smile, etc.
2 
literary : gray and dark

— sullenly

adverb

— sullenness

/ˈsʌlənnəs/ noun [noncount]