By using an oxymoron, the author adds an element of complexity and encourages the reader to think deeply about a particular idea. So generally oxymorons are not used in very formal writing or speaking. Oxymorons are used for a variety of purposes. Sometimes they’re used to create a little bit of drama for the reader; sometimes they’re used to make a person stop and think, whether that’s to laugh or to wonder.
Example..
Act naturally
Open secret
Painfully beautiful
And many more…..
