straightforwardness vs straightforward

straightforwardness is a noun but straightforward is not a noun.

Word	Noun	Adjective	Verb	Adverb
straightforwardness	Yes	No	No	No
straightforward	No	Yes	No	No

straightforwardness (noun)	straightforward (noun)
the quality of being direct and straightforward
without hypocrisy

straightforwardness (adjective)	straightforward (adjective)
	pointed directly ahead
	without evasion or compromise
	without concealment or deception; honest
	free from ambiguity