Pedantic is an insulting word used to describe someone who annoys others by correcting small errors, caring too much about minor details, or emphasizing their own expertise, especially in some narrow or boring subject matter; overly concerned with small details or formalisms, especially in teaching. Ex: Mr. Schleifer can be a bit pedantic whenever he corrects our papers, frequently pointing out typos, missing commas, and lack of appropriate apostrophes.