* Formal: "The chef was known for his fastidious attention to detail, meticulously ensuring each dish was perfectly plated."
* Informal: "My roommate is so fastidious about cleanliness that she cleans the bathroom twice a day."
* Descriptive: "She approached her work with a fastidiousness that bordered on obsession, leaving no detail unchecked."
* Humorous: "He was so fastidious about his appearance that he even ironed his socks."
As you can see, "fastidious" can be used to describe someone who is very careful and attentive to details, often to the point of being picky or fussy.