saudisch
Saudi
Relating to Saudi Arabia, its population, culture, or politics.
Die saudische Wirtschaft ist stark vom Ölexport abhängig.
The Saudi economy is heavily dependent on oil exports.

Saudi
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Saudi
Relating to Saudi Arabia, its population, culture, or politics.
Die saudische Wirtschaft ist stark vom Ölexport abhängig.
The Saudi economy is heavily dependent on oil exports.

The adjective 'saudisch' (Saudi) is derived from the country name 'Saudi-Arabien' (Saudi Arabia). The ending '-isch' is a very common way to form adjectives from country names or regions.
Er interessiert sich für die saudische Geschichte.
He is interested in Saudi history.
Like most adjectives, 'saudisch' (Saudi) can stand before a noun or be used with verbs like 'sein' (to be). When it stands before a noun, it is declined. When it stands after 'sein', it remains unchanged.
Ein saudischer Geschäftsmann hat das Unternehmen gekauft.
A Saudi businessman bought the company.
'Saudisch' (Saudi) is often combined with nouns that relate to the state, the economy, or the culture. Common examples are 'die saudische Regierung' (the Saudi government), 'saudisches Öl' (Saudi oil), or 'die saudische Flagge' (the Saudi flag).
Die saudische Währung ist der Rial.
The Saudi currency is the riyal.
Arabic
'arabisch' and 'saudisch' can both have to do with culture, people, or countries of the Arab world. 'arabisch' is the general term and can also mean the language. 'saudisch' refers specifically to Saudi Arabia, its population, culture, or politics. The words are easy to confuse because Saudi Arabia is an Arab country. If you mean the larger Arab world or the language, 'arabisch' fits. If you mean Saudi Arabia specifically, 'saudisch' is more precise.

In den Nachrichten spricht man über die saudische Regierung.
The news is talking about the Saudi government.
Am Telefon übe ich arabische Sätze für die Reise.
On the phone, I practice Arabic sentences for the trip.