Unauthorized Meaning & How to Use It

Updated 5 November 2026 · Standard formula, shown below

Unauthorized means not officially permitted, approved, or empowered by the person or organization with authority. It is a standard English adjective, commonly used in notices, policies, and everyday explanations when someone acts or accesses something without the required permission.

Definition and grammatical use

Unauthorized describes a person, action, or thing that lacks authorization. Depending on context, authorization may be permission from an owner, an employer, an administrator, a government body, or another party entitled to grant it. The word does not by itself say whether the action was harmful, illegal, or intentional; it says that the necessary permission or approval was absent.

It is an adjective, not slang or an informal substitute for “illegal.” It typically comes before a noun, as in “unauthorized access,” or after a linking verb: “The transaction was unauthorized.” The closely related adverb is unauthorizedly, but it is uncommon and often sounds awkward. Writers generally recast the sentence: “The person accessed the account without authorization.”

Unauthorized user: a user who has not been granted access.
Unauthorized copy: a copy made or distributed without the relevant permission.
Unauthorized absence: an absence not approved under the applicable rules.

Origin and spelling

Unauthorized is formed from authorize plus the negative prefix un- and the adjective ending -ed. Authorize entered English through French forms related to Latin auctor, meaning an originator or promoter, and auctoritas, meaning authority or influence. The underlying idea is the granting of authority or permission; unauthorized negates that grant.

The spelling differs by variety of English. Unauthorized is the usual American spelling; unauthorised is standard in British English and in many other varieties that use the -ise spelling. Both forms have the same meaning. Choose the spelling that matches the publication or audience, and be consistent.

How it is used in real sentences

The word often appears in formal or administrative language because it efficiently identifies a missing approval. It can also be used in ordinary conversation. These examples show how the meaning depends on the noun it modifies:

“The building’s alarm sounded after an unauthorized person entered the restricted area.” The person did not have permission to enter.
“Contact your bank if you notice an unauthorized charge.” The account holder did not approve the charge; the sentence does not establish who made it or whether it was fraudulent.
“The employee installed unauthorized software on a company computer.” The software had not been approved under the organization’s rules.
“The article contains an unauthorized reproduction of the photograph.” The reproduction was made or used without the relevant permission.
“He was absent without authorization.” This phrasing is more natural than “He was unauthorized absent.”

In a sentence, keep the adjective next to the thing that lacks approval: “unauthorized access,” not “access unauthorized” in ordinary prose. It can also appear after a noun with a linking verb: “The account change was unauthorized.” For a person, the term may describe their access or status, but it does not necessarily mean they are a criminal or an intruder. A person can make an unauthorized change by mistake, or a procedure may simply require approval that was not obtained.

Unauthorized versus related words

Several nearby words overlap, but they are not interchangeable in every situation:

Unapproved emphasizes that an approval step has not been completed. A proposed expense can be unapproved without anyone having acted on it.
Unpermitted means not permitted, but it is less common in many contexts than “not permitted” or “unauthorized.”
Unlicensed means lacking a required license. A license is a particular formal permission, so an unlicensed activity may also be unauthorized, but the terms do not mean exactly the same thing.
Illegal means contrary to law. Unauthorized activity may violate a law, a contract, a workplace policy, or only a particular approval process. The adjective alone does not settle which applies.
Unsolicited means not requested. An unsolicited message may still be authorized in some sense, while an unauthorized action need not be unsolicited.

A common misconception is that “unauthorized” automatically means “fraudulent” or “against the law.” The word alone does not establish either conclusion. For example, a purchase might be unauthorized by an account holder but still require investigation before anyone can say who made it or whether it meets a legal definition of fraud. In a policy or legal setting, read the surrounding rules and facts rather than treating the adjective as a complete judgment.

Choosing the right phrase

Use unauthorized when the key point is that permission or authority was missing. If the facts are not yet clear, more specific wording can avoid overstating what happened:

Identify the permission involved. Say “not approved by the account holder,” “not authorized by the system administrator,” or “not permitted by the policy” when you know who had authority.
Separate the act from the conclusion. “An unauthorized login was recorded” reports a status; “a criminal broke in” makes stronger claims about the person and conduct.
Use “without authorization” when it reads more naturally. For example, “The records were shared without authorization” is often clearer than a phrase such as “unauthorized sharing of records,” especially when the sentence is already complex.
Match the register and spelling. The term is suitable for both formal notices and plain communication, but a simpler phrase such as “without permission” may be easier for a general audience. Follow the audience’s spelling convention.

In security notices, “unauthorized access” is a broad description, not a technical explanation of how access occurred. In a workplace, “unauthorized purchase” may mean a purchase exceeded a person’s delegated authority, even if the item itself was ordinary. In publishing, permission can depend on the rights holder and the use, so “unauthorized” should not be used as a substitute for explaining which permission was missing.

Frequently Asked Questions

Does unauthorized mean illegal?
No. It means lacking the relevant permission or approval. Whether the conduct is illegal depends on the applicable law and facts; a policy violation or unapproved action is not automatically a crime.

Is unauthorized a real word or slang?
It is a standard English adjective, not slang. It is widely used in formal writing, policies, notices, and ordinary speech.

What is the difference between unauthorized and unapproved?
Both can describe missing permission. “Unapproved” often focuses on an approval process or decision, while “unauthorized” emphasizes that authority or permission was absent. The best choice depends on what the situation specifically involves.

Is it unauthorized or unauthorised?
Both spellings are standard. “Unauthorized” is the common American spelling; “unauthorised” is common in British English and other varieties that generally use -ise.

Can a person be called unauthorized?
Yes, especially in phrases such as “an unauthorized user.” It means the person has not been granted the relevant access or authority, not necessarily that they acted deliberately or committed a crime.

What is the opposite of unauthorized?
Authorized is the direct opposite: it means permitted, approved, or officially empowered. “Authorized access,” for example, is access granted by the relevant authority.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.