Inadmissible means not allowed or not acceptable, especially in formal settings like a courtroom or official process. When a judge rules that evidence is inadmissible, it cannot be shown to the jury or used to decide the case, no matter how interesting or important it might seem.

Evidence becomes inadmissible for specific reasons: maybe the police obtained it illegally, or someone is trying to share rumors they heard instead of facts they witnessed themselves. Courts have strict rules about what counts as fair evidence because they want to protect people's rights and ensure trials reach just conclusions based on reliable information.

The word appears in other formal contexts too. A college might reject an application because certain test scores are inadmissible under its requirements. A debate judge might rule that a particular argument is inadmissible because it breaks the competition's rules.

The opposite is admissible, meaning something is allowed or acceptable. Think of inadmissible as a formal way of saying “that doesn't count” or “you can't use that here.” When something is inadmissible, it has been officially rejected or excluded from consideration.