1. most dirty, grimy, or unclean in appearance
Usage: superlative form of grungy
2. most shabby, run-down, or deteriorated in condition
Usage: superlative form of grungy

Examples

• This is the grungiest bathroom I’ve ever seen.
• He wore his grungiest clothes to work in the garden.
• The grungiest apartment in the building was surprisingly affordable.
• She found the grungiest corner of the garage to store old paint cans.
• The grungiest part of the city was scheduled for renovation.
• His grungiest sneakers were perfect for hiking through mud.