flexible vs flexibleness

flexible is not a noun while flexibleness is a noun.

Word	Noun	Adjective	Verb	Adverb
flexible	No	Yes	No	No
flexibleness	Yes	No	No	No

flexible (noun)	flexibleness (noun)
	the property of being flexible; easily bent or shaped
	the quality of being adaptable or variable

flexible (adjective)	flexibleness (adjective)
able to flex; able to bend easily
capable of being changed
making or willing to make concessions
able to adjust readily to different conditions
bending and snapping back readily without breaking