形容詞 glum:

1. reflecting gloom
   同義詞：gloomy, long-faced
2. showing a brooding ill humor
   同義詞：dark, dour, glowering, moody, morose, saturnine, sour, sullen

1. Don't look so glum!
   別那樣悶悶不樂。

glum

adj.（形容詞）
glum.mer,glum.mest
Moody and melancholy; dejected.
悶悶不樂的：愁眉不展的，悲傷的；沮喪的
Gloomy; dismal.
憂郁的；郁悶的
n.（名詞）
The quality or state of being moody, melancholy, and gloomy or an instance of it:
悶悶不樂，憂郁：愁眉不展、悲傷、憂郁的狀態(tài)或性質(zhì)或這種事例：
例句：
.He was a charming mixture of glum and glee.(Lillian Hellman)
.他是一個(gè)很有魅力的人，時(shí)而憂傷時(shí)而歡笑.(莉蓮·赫爾曼)

glums Chiefly British The blues. Often used withthe :
glums 【多用于英國】 憂傷。常與the 連用：
例句：
.Most other publications have got the glums.(Tina Brown)
.其他大多數(shù)出版物也感染上憂傷的色彩.(蒂娜·布朗)

來源：
; akin to Probably akin to Middle English gloumen [to become dark] * see gloom
；類似于 可能類似于 中古英語 gloumen [變黑，陰郁] *參見 gloom

【引伸】
glum.ly
adv.（副詞）
glum.ness
n.（名詞）
<參考詞匯><同義詞>glum,gloomy,morose,dour,saturnineThese adjectives mean having a broodingly cheerless aspect or disposition.
這些形容詞都指不高興的性情。
Glum implies silent dejection:
Glum 指沉悶的沮喪，低沉：
例句：
Why so glumô The votes haven`t been counted yet.
為什么那么氣餒？選舉結(jié)果還沒出來呢。

Gloomy suggests somber melancholy:
Gloomy 指悲觀的：
例句：
She takes a gloomy view of the future.
她對(duì)將來很悲觀的。

Morose implies sourness of temper and a tendency to be uncommunicative:
Morose 指脾氣壞的，乖僻的，不愿交注的：
例句：
He stared down at his dinner plate in a morose and unsociable manner.
他低頭盯著餐盤，一副冷淡不友好的樣子，

Dour especially suggests grimness or humorlessnessand sometimes an obstinate nature:
Dour 尤指嚴(yán)肅或毫無幽默感，有時(shí)指倔強(qiáng)呆板的性質(zhì)：
例句：
.To a Western eye, [they] seem poorly dressed, ill-groomed, dour and preoccupied. (Peter Lewis).
.在西方人看來， 顯得似乎衣著寒磣，不修邊幅，桀驁不馴. （彼得·劉易斯）。

Saturnine suggests gloominess or melancholy of temperament and often a tendency to be bitter or sardonic:
Saturnine 指性格陰郁，常指冷峻、嚴(yán)厲的意向：
例句：
the saturnine faces of the judges.
法官們那陰沉的臉色