Haitian
The proper adjective is Haitian.
The official name of Haiti is the Republic of Haiti.
The proper adjective for southwest is "southwestern."
The proper adjective for Georgia is Georgian.
The proper adjective for Mississippi is "Mississippian."
The proper adjective is Haitian.
The correct spelling of the proper adjective and demonym is Haitian (of or from Haiti).
The official name of Haiti is the Republic of Haiti.
The proper adjective for southwest is "southwestern."
The proper adjective for Portuguese is "Portuguese."
Vietnamese is the proper adjective for Vietnam.
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.
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.