Proper Adjective Definition

A proper adjective is an adjective that is written with a capital letter. They are often derived from proper nouns:

A Japanese camera- Japanese is derived from the proper noun Japan.

This is not always the case:

Native Americans- Native is not derived from a proper noun, but is capitalised as the words together form the name of the group of people.

 

Ordinary adjectives that are not written with a capital letter are common adjectives.