unerlaubt
unauthorized
Not permitted; violating a rule or law.
Das Betreten des Geländes ist für Unbefugte unerlaubt.
Entering the premises is unauthorized for persons without permission.

unauthorized
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unauthorized
Not permitted; violating a rule or law.
Das Betreten des Geländes ist für Unbefugte unerlaubt.
Entering the premises is unauthorized for persons without permission.

The word is made up of the prefix 'un-' and 'erlaubt' (allowed). 'Erlaubt' is the past participle of 'erlauben' (to allow). So 'unerlaubt' literally means 'not allowed.'
Das Fotografieren in diesem Museum ist streng unerlaubt.
Taking photos in this museum is strictly unauthorized.
This word belongs to a formal, official style of language. It is often found in legal texts, on prohibition signs, or in house rules.
Auf dem Schild stand: „Unerlaubtes Betreten wird bestraft.“
The sign said: 'Unauthorized entry will be punished.'
'Unerlaubt' is very often used as an adverb to describe an action that violates a rule. Typical examples are 'unerlaubt parken' (to park illegally/without permission) or 'sich unerlaubt entfernen' (to leave without permission).
Er hat sein Auto unerlaubt im Halteverbot geparkt.
He parked his car illegally in the no-stopping zone.
black
'schwarz' and 'unerlaubt' can both mean that something is not officially allowed. 'unerlaubt' is general and neutral: it can refer to any rule or law. 'schwarz' is more colloquial and is used especially for work, trade, or money when something happens without registration or permission. If you are speaking objectively about a rule, 'unerlaubt' is more precise. 'schwarz' sounds more natural when talking about illegal work or unregistered activities.

Im Museum ist das Fotografieren mit Blitz unerlaubt, weil die Bilder geschützt werden sollen.
Flash photography is not allowed in the museum because the pictures need to be protected.
Der Nachbar hat jahrelang schwarz gearbeitet und keine Steuern gezahlt.
The neighbor worked illegally for years and paid no taxes.