acceptable vs unimpeachable

acceptable and unimpeachable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
acceptable	No	Yes	No	No
unimpeachable	No	Yes	No	No

acceptable (adjective)	unimpeachable (adjective)
worthy of acceptance or satisfactory	completely acceptable; not open to exception or reproach
adequate for the purpose	free of guilt; not subject to blame
meeting requirements	beyond doubt or reproach
judged to be in conformity with approved usage