frivolousness       
noun [ U ] uk/ˈfrɪv.əl.əs.nəs/ us/ˈfrɪv.əl.əs.nəs/
 轻佻,轻浮
the quality of behaving in a silly way and not taking anything seriously
  We can't completely blame young people for their frivolousness. 我们不能完全责怪年轻人的轻浮。 
 They criticised the frivolousness of the entertainment industry. 他们批评娱乐业的轻浮。 
 See: frivolous
 - More examples
 - He sang the song with a frivolousness better suited to a cosmetics commercial.
 - She complained that there was too much frivolousness in politics.
 - People still see in him a certain childish frivolousness.