undeclared vs unacknowledged

undeclared and unacknowledged both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undeclared	No	Yes	No	No
unacknowledged	No	Yes	No	No

undeclared (adjective)	unacknowledged (adjective)
not announced or openly acknowledged	not recognized or admitted
	not openly acknowledged