seamy
adjective uk/ˈsiː.mi/ us/ˈsiː.mi/
（情形）丑恶的，肮脏的
(of a situation) unpleasant because of a connection with dishonest behaviour, violence, and illegal sex
The film vividly portrays the seamy side of life in London in the early 1970s. 电影生动地再现了上世纪70年代初伦敦生活中丑恶的一面。