tasteless  
adjective uk/ˈteɪst.ləs/ us/ˈteɪst.ləs/
  (LIKELY TO UPSET)      
 C2 格调不高的,不得体的
likely to upset someone
  tasteless jokes 不雅的笑话 
   (NO FLAVOUR)      
 C1 无味道的
having no flavour
  The meat was dry and tasteless. 这块肉干巴巴的,没有味道。 
   (NOT STYLISH)      
C2 不时髦的,不新潮的,没有品味的
not stylish
  the tasteless decor in the house 房子里毫无品味的装修