pedantic

adjective2

1. •
   Being overly concerned with formal rules and trivial points of learning, like a pedant.

   • Bad news for a certain kind of pedantic patriot (look away now, Jacob Rees-Mogg). Prince Charles has debased the English language – and in a letter to a foreign potentate, no less. — 2019
2. •
   Tending to show off one’s knowledge, often in a tiresome manner.

   • The style is pedantic and reviewish: but I can easily fancy states of mind to which it may be no less salutary on that account. — 1838