Why readability matters more than vocabulary on LinkedIn

There's a temptation, especially among smart people, to write in a way that shows how smart they are. Big words. Complex sentence structures. The kind of language you'd find in a graduate thesis or a management consulting slide deck.

On LinkedIn, this backfires almost every time. I learned this the hard way, and I want to save you the same lesson.

The Hemingway principle

Ernest Hemingway wrote some of the most powerful prose in the English language using remarkably simple words. Short sentences. Common vocabulary. His writing doesn't feel dumbed down. It feels deliberate.

That's the goal on LinkedIn too. You're not writing for a professor who will grade your vocabulary. You're writing for a human being who has 40 unread notifications and a meeting in ten minutes. The simpler your language, the more likely they are to actually absorb your message.

I think of it this way: impressive vocabulary creates distance between you and the reader. Simple language creates connection. On a social platform, connection wins every time.

Your audience is more diverse than you think

LinkedIn has over a billion members across the globe. Even if you write in English, a significant portion of your readers learned English as a second or third language. Words that feel basic to a native speaker might not be basic at all to someone in Bangalore or Berlin or Bogota.

When you choose "use" over "utilize," "help" over "facilitate," or "start" over "initiate," you're not losing anything. You're gaining readers. The meaning stays the same, but the door opens wider.

I once rewrote a post, swapping every fancy word for its simplest alternative. Same ideas, same structure. The rewrite got three times the engagement. The content didn't change. The accessibility did.

Readability is about more than word choice

Vocabulary is just one piece of the readability puzzle. Sentence length matters just as much, sometimes more. You can use simple words and still create unreadable text if your sentences run on for 40 or 50 words at a time.

The Automated Readability Index captures both: word complexity (measured by character count) and sentence length. A post with simple words but marathon sentences will still score high, meaning it's hard to read. You need both to be working in your favor.

When I'm editing a post, I look for sentences I can split in two. If I find a conjunction in the middle of a long sentence, that's usually where the break should go. Two shorter sentences almost always read better than one long one on a screen.

The ARI sweet spot for LinkedIn

For LinkedIn specifically, I aim for an ARI score between 6 and 8. That puts your writing at roughly a middle school reading level, which sounds low until you realize that's where most bestselling books land too.

A score in this range means your post is effortless to read. The reader doesn't have to work to understand you. They can focus on your ideas instead of parsing your syntax. That's when real engagement happens.

Going below 6 can make your writing feel choppy or oversimplified. Going above 10 means you're asking your reader to work harder than they want to on a social feed. The 6 to 8 range gives you room to be thoughtful without being dense.

Simple language is not simple thinking

This is the part that trips people up. They equate simple writing with simple ideas. But the opposite is closer to the truth. Explaining a complex concept in plain language is harder than explaining it in jargon. It requires you to actually understand what you're talking about.

Richard Feynman was famous for explaining physics to anyone. Not because he simplified the ideas, but because he found the right words to make them clear. That's the skill worth developing. Not a bigger vocabulary, but a better ability to translate complexity into clarity.

When you write a LinkedIn post in plain language, you're demonstrating mastery, not hiding from it. Anyone can use big words. Not everyone can make complex ideas feel obvious.

A practical test

Before you publish your next post, try reading it out loud. If any sentence feels awkward to say, it will feel awkward to read. If you stumble over a word, your reader probably will too.

Then look for any word with more than three syllables and ask: is there a shorter word that means the same thing? Usually there is. "Approximately" becomes "about." "Subsequently" becomes "then." "Demonstrate" becomes "show."

These swaps feel minor in isolation, but they add up. A post full of small, clear words reads like a conversation. A post full of long, formal words reads like a memo. On LinkedIn, conversations get engagement. Memos get scrolled past.