coordinate adjectives: commas between equal modifiers
The comma between two adjectives of equal rank.
Put a comma between coordinate adjectives: a long, dull meeting. The adjectives are coordinate if you can insert and or reverse them: a dull, long meeting. Do not use the comma before an adjective that forms a unit with the noun: an old oak table, not an old, oak table.
Examples
Usea sharp, cold wind
Usea sharp winter wind
Avoida sharp, winter wind