What does "nitpicking" mean?

The painstaking process of removing nits (lice eggs) from someone's hair.

What is a synonym for "nitpicking"?

Common synonyms include: captious, carp, carper, carping, cavil, caviling.

noun

noun ·3 syllables ·Uncommon ·College level

Noun

1
The painstaking process of removing nits (lice eggs) from someone's hair. countable, uncountable
2
A process of finding or pointing out tiny details or errors, particularly if the pointed-out details seem insignificant or irrelevant to all but the finder. broadly, countable, figuratively, uncountable
""Of all life's pleasures, I like nitpicking the best." -- Wally in Dilbert"

"Please don't nitpick just for the sake of nitpicking."

From nit + picking.