Use a comma in between coordinate adjectives; do not use one in between cumulative adjectives.
*I use the term “rule”; however, please know that they are more like guidelines, and once you know and understand this rule, you may chose to break it to create an intentional effect.
Terms to Know:
Coordinate adjectives: adjectives that work separately to describe a noun
Cumulative adjectives: adjectives that work together to describe a noun
Greg stuffed the slim, geeky boy in his locker. ==> Use a comma between slim and geeky as they are each separately describing the noun.
The bright red fire truck crashed into Greg’s house. ==>Do not use a comma between bright, red, and fire as they are working together to describe the noun.
- The former overweight woman fit into her new colorful polka-dot bikini.
- On this cold cloudy day, I wore my warm fluffy jacket.
- That wonderful old French car belonged to my smart flamboyant Grandma.
- The former (no comma) overweight woman fit into her new (no comma) colorful (no comma) polka-dot bikini.
- On this cold, cloudy day, I wore my warm, fluffy jacket.
- That wonderful (no comma) old (no comma) French car belonged to my smart, flamboyant Grandma.