continuously vs endlessly

continuously and endlessly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
continuously	No	No	No	Yes
endlessly	No	No	No	Yes

As adverbs, continuously and endlessly are synonyms defined as:

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

continuously (adverb)	endlessly (adverb)
at every point	continuing forever without end
with unflagging resolve	with unflagging resolve
	all the time; seemingly without stopping
	(spatial sense) seeming to have no bounds