unsure about commentary on this

Johnny_2hu said in comment #2589975:

unsure about commentary on this

不 (fu): Means "not," "un-," or "non-". It acts as a negation prefix.
尽 (jin): Means "to exhaust," "to use up," "to run out," or "to reach the limit."

Literally inexhaustible, so Endless works, alluding to her immortality I'd guess.

Or any number of other renditions - unending, boundless, infinite.