1. most extremely particular, demanding, or hard to please about details
Usage: superlative form of finicky

Examples

• She’s the finickiest eater in our family, refusing anything with onions.
• The finickiest customer spent an hour choosing the perfect shade of paint.
• Even the finickiest critics praised the restaurant’s attention to detail.
• He’s the finickiest person I know when it comes to organizing his desk.
• The finickiest cat in the shelter finally found the right owner.
• My grandmother was the finickiest cook, measuring every ingredient precisely.