Disinterested vs. Uninterested: A Prefix Changes Everything

When someone tells you a boring story, your attention may start to wander. That's because you're uninterested — or is it disinterested? These words may seem like synonyms, but their definitions are actually quite different.

Disinterested - Referee Watching Play vs Uninterested - man looking at phone at football match Disinterested - Referee Watching Play vs Uninterested - man looking at phone at football match
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Does Disinterested or Uninterested Mean Bored?

Both disinterest and uninterest mean "not interested." Why aren't they interchangeable? The answer lies in the two meanings of interested: "engaging the mind" and "biased in one direction" (also known as "vested interest").

  • disinterested - not partial, having no stake in the outcome
  • uninterested - bored, inattentive, not interested

One example of a disinterested person is a referee at a soccer game. The ref is unbiased because he only cares about the rules; he doesn't care who wins the game. An uninterested person is the fan in the stands whose team is losing badly; he's no longer interested in watching the game.

Why It's Confusing

The double meaning of interested makes these words confusing, not to mention the similarity of their prefixes (dis- means "away from," un- means "not"). But another confusing detail of disinterested vs. uninterested is that they used to have the opposite meanings!

While their modern definitions have been in place since the late 18th century, the words are often still used interchangeably, and many dictionaries list both meanings for both words. However, proper use of disinterested does not make it a synonym of uninterested.

Disinterested Means Unbiased

When someone is disinterested, they are unbiased and have no vested interest in the matter. They have nothing to lose and nothing to gain.

For example, you may not be disinterested when your best friend has an argument with someone — because you would take your best friend's side. Additional examples of disinterested in a sentence include:

  • A jury must be disinterested when deciding on the verdict of a case.
  • The disinterested teacher listened to both students tell their side of the story.
  • When choosing between buyers, the seller had to make a disinterested decision.
  • Brandon couldn't coach his son's team because he couldn't be truly disinterested and fair.
  • Can you form a disinterested opinion about the matter, or have you chosen a side?
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Uninterested Means Bored

If you're trying to say that someone was bored or not engaged by an activity, use the word uninterested. It's the clearest way to express that a person was "not interested." For example:

  • Despite the teacher's fun lesson, the class remained uninterested.
  • I recommended a trip to the new lake house but Hank seemed uninterested.
  • She was uninterested in Luke's idea to build a deck outside.
  • The uninterested team listened to their coach's boring lecture once again.
  • We tried to teach our puppy how to fetch, but she's uninterested in tricks.

Does the Difference Matter?

The above sentences may feel odd to you if you're used to using disinterested to mean "not interested." So if other writers these words interchangeably, and the dictionaries even include the definition, does the difference between disinterested and uninterested even matter?

It does matter when it could result in reader misunderstanding. For example:

  • Jack was disinterested in the outcome of the election.
  • Jack was uninterested in the outcome of the election.

At first glance, these sentences seem to say the same thing: "Jack didn't care about the outcome of the election." But if you understand disinterest to mean "unbiased," then the first sentence implies that Jack has no personal stake in the election. He may care about it a lot, but it won't affect him either way. That's why only using uninterested to mean "not interested" is the best way to avoid misunderstanding.

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Have a Vested Interest in Proper Word Choice

Using the correct word is a small but significant way to improve your writing. Mastering confusing word pairs such as disinterested vs. uninterested can help you communicate clearly without sending the wrong message. If you'd like to clear up additional word mix-ups, check out a guide on mistrust vs. distrust.