unbound vs unshackled

unbound and unshackled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unbound	No	Yes	No	No
unshackled	No	Yes	No	No

unbound (adjective)	unshackled (adjective)
not restrained or tied down by bonds	not bound by shackles and chains
not secured within a cover
not held in chemical or physical combination