Fastidious means extremely careful about details and very particular about things being done exactly right. A fastidious person notices small mistakes that others might miss and cares deeply about getting every detail correct.

You might have a fastidious friend who arranges her desk with perfect precision, lining up pencils and keeping papers in exactly the right order. A fastidious chef tastes every dish multiple times, adjusting the seasoning until it's precisely right. A fastidious editor reads through a manuscript, checking every comma, every word choice, every fact.

The word often describes someone who's meticulous about cleanliness or appearance. A fastidious housekeeper might vacuum the same room twice to catch every speck of dust. A fastidious dresser makes sure their shirt is perfectly tucked in and their shoes are spotless.

Fastidious can be a compliment when it means thorough and excellent, but it can also suggest someone who's too picky, spending hours fussing over tiny details that don't really matter. The key is whether that attention to detail serves a real purpose. A fastidious surgeon checking every instrument before an operation? Essential. A fastidious eater who refuses any food that isn't cut into perfect squares? Perhaps excessive.