Which sentence correctly uses a comma between two adjectives with reversible order?

• A. The intelligent, passionate student.
• B. The passionate intelligent student.
• C. The intelligent passionate student.
• D. The intelligent, passionate student today.

Answer: (A)

Two adjectives that both describe the same noun and have equal weight are called coordinate adjectives. When they’re coordinate, you separate them with a comma because each one independently describes the noun, and you can swap their order without changing the meaning.

In this sentence, intelligent and passionate both independently describe the student, and you can swap them: a passionate, intelligent student. The comma signals that both adjectives are coordinating modifiers, not one building on the other. That’s why the version with the comma is the natural, correct choice.

Without the comma, the adjectives feel more like a single combined description, or their relationship isn’t parallel, which makes the phrase less natural. The extra word today in the other option doesn’t affect the core idea of whether the adjectives coordinate, so the clean example remains the best illustration of the rule.