rakishness          
noun [ U ]  old-fashioned uk/ˈreɪ.kɪʃ.nəs/ us/ˈreɪ.kɪʃ.nəs/
 漫不经心
the quality of being confidently careless and informal
  They wear tweed caps in various angles of rakishness. 他们头上随意斜扣着粗花呢帽。 
  放荡形骸,骄奢淫逸
immoral behaviour, often that of a man who has sex with a lot of women
  The three women are wary of the rakishness of men. 这三个女人对男人的放荡形骸很有戒心。 
 She made him want to reform his rakishness. 因为她,他想改变自己的放荡形骸。 
 - More examples
 - He could never wear headgear with the rakishness of a baseball cap, especially one worn backward.
 - Her unapologetic rakishness made her so easy to like.
 - He brings a jovial rakishness to the character of Benjamin Franklin.
 - He is open and expansive, with just a hint of rakishness.
 
See: rakish