shortsightedness vs shortsighted

shortsightedness is a noun but shortsighted is not a noun.

Word	Noun	Adjective	Verb	Adverb
shortsightedness	Yes	No	No	No
shortsighted	No	Yes	No	No

shortsightedness (noun)	shortsighted (noun)
a lack of prudence and care by someone in the management of resources
(ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred

shortsightedness (adjective)	shortsighted (adjective)
	unable to see distant objects clearly
	lacking foresight or scope
	not given careful consideration