Nitpicky

Part of speech: adjective

Definitions

1. Overly focused on insignificant details or trivial faults
2. Paying too much attention to small, often unimportant aspects that others might overlook
3. Showing a tendency to criticize or highlight trivial issues that do not significantly matter

Etymology: Nitpicky is simply nitpick with the adjective-forming suffix "-y" added, and the suffix itself has a long pedigree: it descends from an Old English ending "-ig" that meant "full of" or "characterized by," as in "stony" or "sandy." The more interesting history lies in the base word. "Nitpick" was formed from "nit," the egg of a louse, and "pick," picking out the eggs from hair or fur. The idea was of removing the tiny, almost invisible pests that others would never bother to notice, and that literal image of fussy hair-combing carried over into the figurative sense of finding fault over trivia.

Synonyms: fussy, finicky, particular

Antonyms: easygoing, tolerant, lenient