unimpeachable vs acceptable

unimpeachable and acceptable both are adjectives.

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

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