fruitlessness       
noun [ U ] uk/ˈfruːt.ləs.nəs/ us/ˈfruːt.ləs.nəs/
 无结果,无用,徒劳
the quality of being unsuccessful or producing nothing of value
  They despaired at the fruitlessness of the meeting. 他们对会议毫无结果感到绝望。 
 She saw the fruitlessness of the situation. 她看到了这种毫无建树的局面。 
 See: fruitless
 - More examples
 - The failure of the war illustrates the fruitlessness of military might alone.
 - I didn't want to point out to her the fruitlessness of her love.
 - He is dispirited by the apparent fruitlessness of his efforts.