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.
A proper adjective for a person from Florida is "Floridian."
Verbs don't describe. They show actions eg talk runor states eg love am is.Adjectives describe nouns and Florida is a noun. Some examples:sunny Florida, popular Florida, crowded Florida.
A proper adjective is a word to describe a noun that is derived from a proper noun; for example, Swiss cheese, Italian leather, Peruvian pottery, Florida orange juice, etc.
The proper adjective for Portuguese is "Portuguese."
The proper adjective for Haiti is Haitian.
The proper adjective for southwest is "southwestern."
Vietnamese is the proper adjective for Vietnam.
The proper adjective for Siam is Siamese.
The proper adjective for George is Georgian.
Freudian is the proper adjective for Freud.
The proper adjective for Mayan is "Mayan."
The proper adjective for Georgia is Georgian.