Arabian.
Before modern-day Saudi Arabia was founded, the area is called Al-Hijaz. When Abdullah ibn Saud conquered the area, he named it after himself.
The proper adjective for Portuguese is "Portuguese."
Mayan is itself a proper adjective.
Russian IS an adjective.
The proper adjective for Mexican is "Mexican."
A proper adjective is an adjective derived from a proper noun, for example the adjective Spanish is from the proper noun Spain. A common adjective is not from a proper noun.Some examples of proper adjectives:King Edward VII; Edwardian architecturePeru; Peruvian potterySwitzerland; Swiss cheeseChristianity; Christian ethicsFranz Kafka; a Kafkaesque situationAsia; Asian foodSome examples of common adjectives:modern architecturehand thrown potterycottage cheesenoble ethicsa difficult situationfried food
A proper adjective is an adjective formed from a proper noun. "Arabian", "Grecian", "Japanese", "African".
The proper adjective form of "Arabia" is "Arab." It is used to describe something related to the Arabian Peninsula or its culture, people, or languages. For example, one might refer to Arabic cuisine or Arab culture.
The word 'Arabian' is the proper adjective form of the proper noun Arabia.
The proper adjective for southwest is "southwestern."
The proper adjective is Haitian.
The proper adjective for Portuguese is "Portuguese."
Vietnamese is the proper adjective for Vietnam.
The proper adjective for George is Georgian.
Mayan is itself a proper adjective.
The proper adjective for Siam is Siamese.
The proper adjective for Georgia is Georgian.
Freudian is the proper adjective for Freud.