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Persian
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.
Egyptian is a proper adjective.
Athenian is a proper adjective for Athens.
No, Egyptian is an adjective used to describe something of or from Egypt (a proper noun). Although Egyptian is an adjective, it is still capitalized.
Persian
The correct spelling of the proper adjective is Scandinavian.
Yes, the word Persian is a proper noun, a word for the language or a person of Persia. The word Persian is also a proper adjective to describe a noun as of Persia (Persian carpet, Persian history).
The likely term is the proper noun, an historical region, Persia (now Iran).
Those letters will spell the proper noun or proper adjective African.
The correct spelling of the proper noun or adjective is Portuguese.
That is the correct spelling of the proper adjective Virginian (from Virginia).
The correct spelling of the proper noun or adjective is Jamaican.
The proper adjective or term for people from China is Chinese.
Persia
An adjective describes a noun. You could potentially describe a person or thing as "Vietnamese".
The proper adjective for a person, thing, or characteristic is European (capitalized).