Definitions

1. adjective

the most unpleasant or dirty; the most inferior or cheapest

“This dingiest part of the city needs more investment to improve the living conditions.”

2. superlative noun

the most unpleasant or dirty place

“The dingiest place in town was the abandoned factory.”

3. comparative adjective

more unpleasant or dirty than others

“This dingiest part of the town is where the locals prefer to avoid.”