mirth·less /ˈmɜːθləs $ ˈmɜːrθ-/ adjectiveadj literaryHAPPY# mirthless laughter or a mirthless smile does not seem to be caused by real amusement or happiness 〔微笑等〕没有欢乐的，忧郁的，悲哀的 ‘Now it’s your turn, ’ he said with a mirthless grin. “现在轮到你了。”他咧着嘴苦笑道。
—mirthlessly adverbadv He smiled mirthlessly. 他苦笑了一下。
mirthless• But it was a titter far from being mirthless.• Her scrunched up face made her look as if she was wearing a perpetual mirthless grin.• Others portrayed his austere demeanour and mirthless, rumbling laugh in a more sinister light.