Vietnamese is the proper adjective for Vietnam.
The proper adjective for the proper noun 'Celt' is Celtic.Please note that a proper noun and a proper adjective is always capitalized.
Ghanian is the proper adjective for Ghana.
Since spice isn't a proper noun, it can't have a proper adjective. The adjective of spice is spicy.
Since writer is not a proper noun, it doesn't have a proper adjective.
Hawaii is a proper noun; the related proper adjective is Hawaiian. Rusty is generally a common adjective, although it can be a nickname and thus a proper noun.
No, the adjective Hawaiian is a proper adjective, a word that describes a noun; or a proper noun for a person from Hawaii, also a proper noun.
There can be a crowd (which is a noun) There can be to crowd (which is a verb) But there is no adjective.
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.
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.