1. superlative form of niggling; most petty, trivial, or fussy in nature
Usage: informal; comparative form is 'nigglier'

Examples

• The niggliest details of the contract took hours to negotiate.
• She had a reputation for raising the niggliest objections during meetings.
• Even the niggliest complaint from customers was documented and reviewed.
• He was known for his niggliest approach to proofreading manuscripts.
• The niggliest issues often caused the most delays in the project.