Question

What is the difference between proper and common adjectives?

Answer 1

Proper adjectives have their initial letter capitalized

Step-by-step explanation:

Most adjectives used in writing and speech are common adjectives. Common adjectives are not capitalized. This is because they are everyday words, not derived from proper nouns. Proper adjectives are derived from proper nouns.

Answer 2

Proper adjectives have their initial letter capitalised, for example American - derived from a proper noun America - or Victorian - derived from (queen) Victoria.

Common adjectives, on the contrary, don't have their initial letter capitalised, for example green, empty, colourful. Just remember that "common adjective" is not a scientific term used by linguists, it is informal.