unbroken vs kept

unbroken and kept both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unbroken	No	Yes	No	No
kept	No	Yes	No	No

As adjectives, unbroken and kept are synonyms defined as:

unbroken and kept: (especially of promises or contracts) not violated or disregarded

unbroken (adjective)	kept (adjective)
not broken; whole and intact; in one piece	(especially of promises or contracts) not violated or disregarded
marked by continuous or uninterrupted extension in space or time or sequence
(especially of promises or contracts) not violated or disregarded
(of farmland) not plowed
not subdued or trained for service or use