spurious

If something is spurious, it seems real, true, or valid, but it is not. Think of a fake coin: it looks right at first, but a closer look shows that it is not genuine. A spurious argument may sound convincing for a moment, yet it falls apart because the evidence is weak or the reasoning is faulty. The idea is that something has the appearance of being right, even though it does not hold up.

The word comes from the Latin "spurius," meaning illegitimate or of uncertain origin. That sense of "not genuine" has carried into modern English. You might meet it in legal contexts (a spurious claim), in science (a spurious correlation, where two things seem linked but are not), or in everyday discussion of claims, excuses, and evidence.

The word "spurious" describes something that is false, fake, or not genuine, even though it appears to be real, true, or valid. It often suggests that something can mislead people because it looks right on the surface. For example: "The antique dealer quickly identified the painting as spurious."

Spurious does not always mean there was an intention to deceive. Sometimes it does involve a forgery or a fake, but often it simply means that something is invalid, unsupported, or only apparently true. A spurious argument may rely on faulty logic or weak evidence. Spurious data may be inaccurate, unreliable, or produced by an error. A spurious claim may sound strong until it is examined closely.

The term often appears in contexts where truth or authenticity matters, such as art, history, science, law, and journalism. You might hear about a "spurious document" that is not authentic, a "spurious correlation" in which two things seem connected by chance, or a "spurious claim" that sounds believable but lacks real support.

Historically, "spurious" was also used to describe someone of illegitimate birth. That use is now uncommon, but it helps explain the older sense of something lacking a true or legitimate origin.

So if something looks sound at first but turns out to be false, unsupported, or not genuine, "spurious" is the right word. It points to something that does not stand up once you examine it more carefully.