broken in vs broken

broken in and broken both are adjectives.

Word	Noun	Adjective	Verb	Adverb
broken in	No	Yes	No	No
broken	No	Yes	No	No

As adjectives, broken in and broken are synonyms defined as:

broken in (adjective)	broken (adjective)
tamed or trained to obey	physically and forcibly separated into pieces or cracked or split
	not continuous in space, time, or sequence or varying abruptly
	(especially of promises or contracts) having been violated or disregarded
	out of working order (`busted' is an informal substitute for `broken')
	destroyed financially
	thrown into a state of disarray or confusion
	discontinuous
	subdued or brought low in condition or status
	weakened and infirm
	imperfectly spoken or written
	lacking a part or parts
	topographically very uneven
	tamed or trained to obey