1. superlative form of finicky; most fussy, particular, or hard to please about details
Usage: informal; superlative degree
2. superlative form of finicky; most requiring careful attention or precise handling
Usage: informal; superlative degree

Examples

• She is the finnickiest eater in the family and refuses most vegetables.
• That old printer is the finnickiest machine in the office; it jams constantly.
• He has the finnickiest taste in music and rarely enjoys what others recommend.
• The finnickiest part of the recipe is tempering the chocolate correctly.
• My cat is the finnickiest about her litter box and demands it be cleaned daily.
• Among all the students, she was the finnickiest about following the exact instructions.