I really believe the discussion of nature has to depend on what the scriptures say. How does Scripture use the word?
I think Scriputre best describes nature two ways – “flesh” and “spirit”. That which is born flesh is flesh, and that which is born spirit is spirit. Human nature is the flesh. Christ took upon Himself this nature. It is the desires of the flesh. And there is biblical evidence that this desire is not always in accordance with the will of God (although not sin in itself). For example, Jesus was tempted to satisfy the desires of the flesh in the wilderness but He overcame temptation. He desired in the flesh not to suffer and die, praying that if possible the cup would pass but not His will but the Father’s be done.
Christ took upon Himself human nature when He became flesh - the Logos (the Word, the Life) becoming human. This is the One nature (the Life, spiritual life, the Word) taking on another (human nature). The Catholic Church argued, debated, and developed a philosophy about how these two natures existed without mixture (mostly a philosophical argument). But Scripture does not separate the two natures in Christ. He is God. He is man. And, although the Catholics will always reject the idea, Scripture teaches that God the Son suffered and died a physical death (not suffered “in His human nature”, but suffered).
Until discussing topics on this board I had never realized just how much RCC doctrine undermines much of contemporary Protestant thought.