Antonyms are pairs or groups of words that are notionally opposite in meaning, such as night/day, boy/girl, long/short, hot/cold, etc. This post describes the four categories of antonyms that feature in the use of English, explains the characteristics of each and offers a number of examples of each type.
When engaged with your academic writing, your first objective is to get those ideas down on paper. This is the creative phase where your main focus is on producing content that satisfies the objectives of your assignment brief or research proposal. Whether the content needs to shine at this point depends on the author. Some believe that content should be polished as you go, but most authors prefer to get the ideas down on paper first, and then later focus on enhancing the content to make it more scholarly and engaging.