Sentence:  "The soul also hath her death, namely, when it lacketh and is destitute of the eternal and godly life, which truly and justly is called the life of the soul: but <WSD>undeadly</WSD> or immortal is it called, because it never ceaseth to live, how miserable soever the life of it be. [...]" 
Meaning of the word marked with <WSD> tags:  Not subject to death; immortal.