The best academic writing provides the most information with the fewest words. This is called being “concise.”
Think of being concise as eliminating unnecessary words.
Sometimes you do this naturally. You’d almost certainly never say this: “The sweater of Brenda is red.” [6 words]
Instead, you’d express the same idea more concisely: “Brenda’s sweater is red.” [4 words]
Although we all speak concisely at times, most writers could trim many words from their writing while preserving the meaning. Concise writing feels much sleeker and effective to readers.
But keep in mind that writing concisely means eliminating UNNECESSARY words. Writing concisely does not mean every sentence must be as short as possible. Sometimes extra words are useful. Here’s a great example. The most famous writing manual written in English is called The Elements of Style, by William Strunk and E.B. White. In Steven Pinker’s new book, The Sense of Style, Pinker quotes White, a student of Strunk’s, talking about Strunk’s lecture style. According to White, Strunk once, with great pomp and ceremony, iterated his perspective on conciseness:
“Omit needless words! Omit needless words! Omit needless words!”
It’s funny at first, because nothing seems less concise than saying the exact same thing three times. But I wouldn’t suggest leaving out a single syllable. None of those words are unnecessary, because they make his utterance, through their sheer humorous irony, unforgettable.