* Formal: The professor presented a treatise on the history of ancient Greek philosophy, detailing the development of key ideas from Socrates to Aristotle.
* Academic: Her treatise on the impact of social media on political discourse was widely praised for its insightful analysis and compelling arguments.
* Informal: My grandmother wrote a treatise on the best way to bake a pie, complete with handwritten recipes and family anecdotes.
* Humorous: He wrote a treatise on the proper way to fold a fitted sheet, but I'm pretty sure his method was just more complicated than necessary.
The word "treatise" suggests a formal and detailed work, often written about a complex subject.