Why can't the word "inclinative" be an adjective version of the word "inclination"?

For example, I have the following sentence: "It may make sense from a naturally inclinative perspective..." However, the word "inclinative" doesn't exist. Why? The word does seem like it would make sense to use as an adjective version of the word "inclination"; it would have the exact same meaning.

However, I just found out that in the Merriam-Webster dictionary the word "inclinational" exists so this does solve my answer. However, why couldn't the word "inclinative" not make sense? Thanks.

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