Which sentence uses the adjective infinite correctly?
the variations on the design are infinite.
the variations on the design are more infinite.
the variations on the design are very infinite.
the variations on the design are the most infinite.

The correct answer for the question that is being presented above is this one: "The variations on the design are infinite." The sentence that uses the adjective infinite correctly is that The variations on the design are infinite. It shows how the word infinite properly used.