sombrely          
adverb UK (US somberly) uk/ˈsɒm.bə.li/ us/ˈsɑːm.bɚ.li/
 严肃地;忧郁地
in a way that is serious, sad, and without humour or entertainment
  "She has lost one brother already," he said sombrely. “她已经失去了一个兄弟,”他忧郁地说。 
 The two conversed sombrely for a while then ordered sandwiches. 两人严肃地交谈了一会儿,然后点了三明治。 
  灰暗地,暗淡地;朴实无华地
in a way that is dark and plain
  She would prefer mourners to dress rather sombrely. 她希望哀悼者穿着灰暗一些。 
 Callers, suitably and sombrely attired, came thick and fast. 来访的人穿着得体而严肃,纷至沓来。 
 See: sombre
 - More examples
 - The night started sombrely with a minute's silence.
 - They walked sombrely to court yesterday at the start of a fresh ordeal.
 - He is dressed casually, if sombrely, in black.