Homeric :]
The proper adjective for George is Georgian.
The proper adjective for Siam is Siamese.
Homer is a proper noun, a name. Names for specific people, places, or things are proper nouns and always capitalized.
The proper adjective for Antigua is Antiganantigan
Kuwaiti is the proper adjective for Kuwait.
Troy is the name of a place. Trojan refers to a person or thing from Troy. Homer wrote about the Trojan War.
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.
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.
Homer is a proper noun, a name. Names for specific people, places, or things are proper nouns and always capitalized.