Often you can just add "ish" to the end of the name
Norway is a proper noun, not an adjective. It is the name of a country. It does not change.
Dave, often a short form of the given name David, is a proper noun, not an adjective. The possessive form (Dave's) would function as an adjective where necessary.
Sarah is a proper name. It isn't an adjective.
No, it is not an adjective. It is a proper noun, the name of a company.
The adjective from Portugal is Portuguese. Portuguese is the name of the language of Portugal, for example.
No, it is a proper noun. It is the name of a person.
No, it is not an adjective. It is a proper noun, a given name or surname.
The proper adjective for Oklahoma is "Oklahoman." This term is used to describe people, things, or attributes related to the state of Oklahoma. It is derived from the name of the state itself and is commonly used in formal and informal contexts to denote a connection to Oklahoma.
Most people should be familiar with the concept of a proper noun, referring to the specific name of a person, place or thing. A proper noun would always be capitalized: Shakespeare, Los Angeles, Honda, etc. In this same manner, a proper noun can be converted into a proper adjective in order to describe another common noun. A proper adjective, such as Japanese or Canadian would also be capitalized, since it was formed from a proper noun such as Japan or Canada.
No. Instead it is a noun. A proper adjective would be a word that describes something, but it is also a name of a place or style, etc.for example: I like French fries. I like Chinesefood.
Lisbon is the name of a city, a proper noun which should be capitalized. There is no English adjective for a person or thing of or from Lisbon, but the proper adjective in Portuguese is Lisboeta.
No, it is a proper noun. It is the name of a person.