Definitions

1. verb

to make or become excessively concerned with or critical of small details

“The editor picayunish the writer’s work, pointing out minor grammar mistakes.”

2. noun

an excessive concern with or criticism of small details

“The author’s picayunish attitude towards the project delayed its completion.”

3. adjective

given to an excessive concern with or criticism of small details

“The picayunish editor had a reputation for being overly critical.”