unceasingly vs unendingly

unceasingly and unendingly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
unceasingly	No	No	No	Yes
unendingly	No	No	No	Yes

As adverbs, unceasingly and unendingly are synonyms defined as:

Other synonyms of unceasingly include ceaselessly, continuously, endlessly, incessantly.

unceasingly (adverb)	unendingly (adverb)
with unflagging resolve	with unflagging resolve