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
Sri lanka
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.
No, old is not a proper adjective. A proper adjective is an adjective derived from a proper noun, such as Swiss cheese, Bolivian pottery, Chinese silk, etc.
The proper adjective for George is Georgian.
The proper adjective for Siam is Siamese.
Mayan is itself a proper adjective.
Freudian is the proper adjective for Freud.
The proper adjective for Georgia is Georgian.
The proper adjective for Antigua is Antiganantigan