1. fussy about small details; hard to please; particular
Usage: informal; chiefly British
2. requiring great attention to detail; tricky or complicated
Usage: informal; chiefly British

Examples

• My grandmother is pernickety about how her tea is prepared.
• He's pernickety when it comes to grammar and spelling.
• The task is pernickety and requires careful attention.
• She has pernickety taste in music and rarely enjoys what others suggest.
• Don't be so pernickety about the small mistakes in the draft.
• Assembling this furniture is a pernickety job with many tiny screws.
• He's pernickety about keeping his workspace organized.