mirth·less
adjective/ˈmɜːθləs/
/ˈmɜːrθləs/
(formal)- (especially of a laugh) not really showing that you enjoy something or think it is funny
并不快乐的；忧郁的 - a mirthless laugh/smile
苦笑
Oxford Collocations DictionaryMirthless is used with these nouns:- laugh
- smile
- a mirthless laugh/smile