different between unchangeably vs everlastingly

English

unchangeable +? -ly

unchangeably (comparative more unchangeably, superlative most unchangeably)

In a way that cannot be varied, or changed.
God is infinitely and unchangeably good.

everlasting +? -ly

everlastingly (comparative more everlastingly, superlative most everlastingly)

In an everlasting manner; without end; forever.
- 1949, George Orwell, Nineteen Eighty-Four, Part Two, Chapter 9, [2]
  Their lives are dedicated to world conquest, but they also know that it is necessary that the war should continue everlastingly and without victory.
perpetually; constantly

(in an everlasting manner): ever, forevermore, until hell freezes over; see also Thesaurus:forever
(perpetually; constantly): ceaselessly, incessantly, nonstop; see also Thesaurus:continuously

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