Comma Rule P: Put a Comma between Coordinate Adjectives.
Definition of Coordinate Adjectives. Adjectives are coordinate if they meet two criteria: (1) You can place and between the two words, and the sentence means the same thing, and (2) You can reverse their order, and the sentence means the same thing.
Sample 1: We had a hot, dry summer.
Sample 1 has the adjectives hot and dry, both used to describe summer. If we write We had a hot and dry summer, the sentence makes sense. It also makes sense if we write We had a dry, hot summer. The adjectives meet both criteria, so we know they are coordinate and put a comma between them.
To native English speakers, the two revised sentences will sound like natural speech, and the two criteria are likely sufficient to identify coordinate adjectives. For a more technical explanation, we can examine the Royal Order of Adjectives.
(If these criteria and revisions make sense to you, skip the next section and go to Rule Q.)
Definition of Royal Order of Adjectives. This is the order in which native English speakers naturally use adjectives in speech and writing. Although exceptions exist, such as to emphasize specific characteristics, this order is generally true. Continue reading