Here are some examples of how "dingy" can be used:
* "The hotel room had a dingy carpet and faded wallpaper."
* "The old, dingy bookstore was filled with dusty books and forgotten treasures."
* "She wore a dingy, grey sweater that looked like it had seen better days."
Essentially, "dingy" is a word that evokes a feeling of drabness, untidiness, and lack of vibrancy.