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unauthorized
adjective
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How to pronounce unauthorized:

Definition of unauthorized:

unauthorized (adjective):
not endowed with authority.
done or made without official permission
not authorized without authority or permission

Synonyms for unauthorized:

inappropriateforbiddenunsuitableunacceptableimpermissibleillegitimateauthorizationmandateillegalillicit
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Antonyms for unauthorized:

commendablemanifestaccreditedpermissiblesufferablevalidchasteobviousconspicuousblatant
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Other 4-syllable words like unauthorized

Here are some other common words that have 4 syllables, like unauthorized does.

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