2 Words to use with protean

And whence comes Life,that occult Force, So rich in its prolific range, So frail and swift to run its course, Yet deathless in protean change?

Besides having the advantage of quiet nerves, she had become inured to the presence of Death in all his protean formsit was impossible that her father should be threatened in a way with which she was not already familiar.

2 Words to use with  protean