Definition
To describe something as seamy means it is sordid, unpleasant, and often associated with morally degraded aspects of life. It suggests a hidden, unpleasant side that is usually kept out of sight. A seamy area might be known for crime and vice. Think of the back alleys in a gritty detective movie. It's about unpleasantness, not necessarily illegality, and evokes a sense of unease. It’s like the underbelly of a city.