Nit-picking refers to overly critical and fussy behavior, often focused on minor, inconsequential details. Synonyms for nit-picking include being finicky, captious, fastidious, overparticular, and pedantic. People who are nit-picking may also be described as nitpickers, hair-splitters, or sticklers, emphasizing their excessive attention to detail or their tendency to criticize unnecessarily. Other related phrases include "splitting hairs," "finding fault," or "picking at nits," a phrase that underscores the minor nature of the issues being criticized. While nit-picking behavior can be aggravating to others, it can also be important for ensuring attention to detail and accuracy in situations where errors can be costly or dangerous.