Pedantic means too concerned with small formal details. Correcting a preposition when somebody is telling you their house burned down.
It is always a criticism, and it is about proportion rather than accuracy, since a pedantic person is usually right and that is precisely the problem. It attaches to points, distinctions and corrections. The noun is a pedant, and being pedantic about grammar is the classic case. There is a self-deprecating British formula in not to be pedantic, which always precedes exactly that.
1adjectivepedanticExcessively concerned with minor details or rules.
“It sounds pedantic, but the two words do mean different things.”
Italian
pedante — a teacher, schoolmaster, pedant
Middle French
pedant
English
pedant
English, today
pedantic
From pedant + -ic. pedant comes from Middle French pedant, pedante, from Italian pedante (“a teacher, schoolmaster, pedant”), associated with unrelated pedagogo. Compare French pédant.
Etymology from Wiktionary, CC BY-SA