saudi
Saudi
Refers to Saudi Arabia, its people, or its culture. It is a commonly used short form of 'saudi-arabisch' (Saudi Arabian).
Die Delegation traf sich mit saudischen Geschäftsleuten.
The delegation met with Saudi businesspeople.

Saudi
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Saudi
Refers to Saudi Arabia, its people, or its culture. It is a commonly used short form of 'saudi-arabisch' (Saudi Arabian).
Die Delegation traf sich mit saudischen Geschäftsleuten.
The delegation met with Saudi businesspeople.

Adjectives that end in -i have a special feature: they can be declined or remain unchanged. Both forms are correct.
Er sprach mit einem saudischen Geschäftsmann.
He spoke with a Saudi businessman.
'Saudi' is the common short form of the official adjective 'saudi-arabisch' (Saudi Arabian). It is often used in the press and in everyday language.
Die Nachrichten berichten über die saudische Wirtschaft.
The news is reporting on the Saudi economy.
The adjective is derived directly from the country name 'Saudi-Arabien' (Saudi Arabia). It refers to the first part of the name, which goes back to the ruling dynasty.
Die saudische Flagge ist grün mit weißer Schrift.
The Saudi flag is green with white writing.
Arabic
'arabisch' and 'saudi' can both have to do with the Arab world, but they differ in how specific they are. 'arabisch' is broader and can mean the Arabic language, Arab culture, or many countries of the Arab world. 'saudi' refers specifically to Saudi Arabia, its people, or its culture. They can be confused because Saudi Arabia is an Arab country. But not everything Arab is Saudi. When it is generally about the language or the Arab world, 'arabisch' fits; when it is specifically about Saudi Arabia, 'saudi' fits.

Im Bericht geht es um die saudi Wirtschaft und neue Projekte im Land.
The report is about the Saudi economy and new projects in the country.
Morgen übersetzt sie den Brief ins Arabische.
Tomorrow she will translate the letter into Arabic.