austerely       
adverb uk/ɔːˈstɪə.li/ us/ɑːˈstɪr.li/
 严厉地;严峻地
in a severe and unfriendly way
  "You have no choice," he said austerely.  “你别无选择,”他严厉地说。 
 See: austere
 - More examples
 - The river is an austerely beautiful 40-mile stretch of water.
 - This is an austerely plotted but moving collection of stories.
 - Dressed austerely - long black skirt, pulled-back hair, no earrings or makeup - she paces the narrow stage with nervous energy.
 - They sat in an austerely furnished room under a bare lightbulb.
 - She smiled a little, austerely.