Coordinate adjectives are two or more adjectives that describe the same noun and are separated by a comma or by the word "and". They are equal in rank and could be reversed without changing the meaning of the sentence.
Here are some examples:
* The old, dusty book was filled with secrets. (Both "old" and "dusty" describe the book equally)
* He wore a bright, red shirt. (Both "bright" and "red" describe the shirt equally)
* The large and powerful dog barked loudly. (Both "large" and "powerful" describe the dog equally)
Important things to remember about coordinate adjectives:
* They are usually separated by a comma or "and".
* They are equal in rank and can be reversed.
* They describe the same noun.
Not all adjectives that appear together are coordinate. Some adjectives are cumulative meaning they build upon each other, and they are not interchangeable. For example:
* He wore a beautiful, red dress. ("Red" modifies "dress" but "beautiful" modifies the whole phrase "red dress". You can't say "red, beautiful dress").
Let me know if you have any other questions!