apprehensiveness vs apprehensive

apprehensiveness is a noun but apprehensive is not a noun.

Word	Noun	Adjective	Verb	Adverb
apprehensiveness	Yes	No	No	No
apprehensive	No	Yes	No	No

apprehensiveness (noun)	apprehensive (noun)
fearful expectation or anticipation

apprehensiveness (adjective)	apprehensive (adjective)
	in fear or dread of possible evil or harm
	quick to understand
	mentally upset over possible misfortune or danger etc