mirthless

adj.

不快乐的，沉闷的，忧郁的；

1. His mirthless smile made all of us uncomfortable.
   他生硬的笑使我们感到很不舒服。
2. His mouth corners curved in his highly individual, cold, almost mirthless smile .
   他嘴角一抿，露出极为独特的，几乎是闷闷不乐的淡笑。
3. We have been fed up with the mirthless routine work all day long.
   我们受够了整天沉闷的日常工作。

Mirthless levity
The Mirthless Content of Skarphedinn's Grin
Grotesque and mirthless humour in
Mirthless laughter in a case of Creutzfeldt-Jakob disease.
Abject Metamorphosis and Mirthless Laughter
"The mirthless laugh": Feeling pain in Samuel Beckett's trilogy of novels
Digging in the Backyard: "Mirthless"at the Powerhouse
'I am the man that mirthless lives' - psychiatry in literature.
Grotesque and mirthless humour in "Midnight Hotel"and Morning Yet on Judgement Day"
Abject Metamorphosis and Mirthless Laughter: On Human-to-Animal Transitions and the 'Disease of Being Finite'