1. having the hardest or thickest crust
Usage: superlative form of crusty
2. most irritable, grumpy, or bad-tempered
Usage: informal; superlative form of crusty

Examples

• The baker selected the crustiest loaf from the batch.
• This is the crustiest bread I’ve ever tried to cut.
• My grandfather gets crustiest in the morning before his coffee.
• The crustiest customer complained about everything in the store.
• Even the crustiest pizza slice was delicious.
• She’s the crustiest teacher in the whole school.