amateurishness       
noun [ U ] uk/ˈæm.ə.tər.ɪʃ.nəs/ us/ˌæm.əˈtʊr.ɪʃ.nəs/
 不熟练;外行
a lack of skill that shows someone is not an expert at something
  He is modest about his artistic talent and often apologizes for his amateurishness.  他对自己的艺术才能很谦虚,并经常为自己的业余行为道歉。 
 Some advertisers bring a deliberate amateurishness to their ads. 一些广告商把他们的广告刻意制作得比较业余。 
 See: amateurish
 - More examples
 - The report shows an amateurishness that becomes more apparent the further one reads.
 - You have to hope the amateurishness of the comedy was intentional.
 - An online interview with the actor combines amateurishness and intelligence.