1. the quality of being particular, hard to please, or overly concerned with details
Usage: uncountable; often used to describe someone who is picky or demanding
2. excessive attention to minor or unnecessary details; fiddling or tinkering
Usage: uncountable; often implies wasted effort or unnecessary complexity

Examples

• Her fussiness about food made it difficult to choose a restaurant.
• The designer's fussiness over every detail resulted in a beautiful but expensive product.
• I appreciate his fussiness when it comes to quality, even if it takes longer.
• The baby's fussiness at bedtime frustrated the parents.
• His fussiness about the arrangement of furniture drove his roommate crazy.
• There's a fine line between fussiness and genuine attention to quality.