blandness       
noun [ U ] uk/ˈblænd.nəs/ us/ˈblænd.nəs/
 无滋味;乏味;没精打采,无生气
the quality of not having a strong taste or character or not showing any interest or energy
  He made a joke about the blandness of the food. 他就食物的清淡开了个玩笑。 
 The characters are familiar to the point of blandness. 对这些角色,都已经熟悉到了平淡无奇的程度。 
 See: bland
 - More examples
 - The office is a model of blandness.
 - Hospital food, once mocked for its blandness, has gone upscale.
 - My usual enthusiasm for life was replaced by blandness.