If someone says something bad about you, you might want to sue them for defamation. But not every negative statement counts. The law draws a sharp line between statements of fact and statements of opinion. Only false statements of fact can be defamatory. Opinions, no matter how nasty or unfair, are generally protected speech. Understanding this distinction is crucial if you are trying to prove that a lie hurt your reputation.

A statement of fact is something that can be proven true or false. If I say “John stole money from his employer,“ that is a factual claim. Either John did it or he didn’t. A court can look at evidence such as bank records, witness testimony, or security footage to verify the accuracy of that statement. If it turns out John never stole anything, that statement is a false fact, and it can be the basis of a defamation lawsuit.

An opinion, on the other hand, is a person’s subjective view. If I say “John is a lousy employee,“ that is an opinion. There is no objective way to prove or disprove whether someone is “lousy.“ Different people can have different standards. Even if John is an excellent employee, my opinion that he is lousy is not a lie in the legal sense. It is just my assessment, and the First Amendment protects my right to express it.

But here is where it gets tricky. Some statements look like opinions but actually contain implied factual claims. For example, if I say “I think John committed fraud,“ the “I think” part makes it sound like an opinion. But the core of the statement—that John committed fraud—is still a factual assertion. A court will look at whether a reasonable person would understand the statement as an expression of opinion or as an assertion of fact. Context matters. If I say it during a heated argument about office gossip, it might be seen as opinion. If I say it in a formal complaint to the police, it looks like a fact.

Courts use a simple test: can the statement be proven false? If yes, it is likely a fact. If no, it is an opinion. Questions like “Is she honest?“ cannot be proven true or false in a courtroom because honesty is a matter of judgment. But a statement like “She lied under oath in the deposition on March 15” can be checked against the court transcript. That is a fact.

Another important point: statements that are exaggerated or obviously rhetorical are also protected as opinion. If I say “My boss is a total psychopath,“ most people understand that I am using hyperbole, not reporting a clinical diagnosis. The law does not treat that as a factual claim. Same with insults like “You’re an idiot” or “This restaurant is disgusting.“ These are called “rhetorical hyperbole” and are not defamatory even if they hurt feelings.

But what if the opinion implies undisclosed facts? For example, if someone says “I would not trust Dr. Smith with my health,“ and the listener knows that the speaker is a former colleague with inside knowledge, the statement might carry an implied claim that Dr. Smith is incompetent. If that implication is false, the speaker could be liable. Courts look at whether the opinion suggests there are specific, unstated facts that support it. If the speaker says “Based on my experience, Dr. Smith is a bad surgeon,“ and the experience is just one bad bedside manner, the implication that Dr. Smith botches surgeries is probably a false fact.

For defamation lawsuits, the key takeaway is this: you cannot win simply because someone said something mean about you. You have to show that they said something that was objectively false and that the false statement damaged your reputation. Opinions, even harsh ones, are not lies. They are protected speech. But if someone hides a false fact inside an opinion, you may still have a case.

Before filing a lawsuit, figure out whether the statement at issue is a verifiable fact or a pure opinion. If it is a fact, gather proof that it is false and that you suffered harm. If it is an opinion, you likely have no legal claim, no matter how much it hurt your reputation. The law respects the right to hold and express opinions, but it does not protect the right to spread lies dressed up as facts.