1. most worn out, threadbare, or in poor condition due to age or use
Usage: superlative form of shabby
2. most unfair, mean, or contemptible in behavior or treatment
Usage: superlative form of shabby

Examples

• He wore his shabbiest clothes to work in the garden.
• The shabbiest building on the block was finally torn down.
• That was the shabbiest treatment I’ve ever received from a customer service representative.
• Her shabbiest coat was still warmer than anything else she owned.
• The shabbiest excuse he could think of was that his alarm didn’t go off.
• Even the shabbiest room in the hotel was clean and comfortable.