subdued vs subduedness

subdued is not a noun while subduedness is a noun.

Word	Noun	Adjective	Verb	Adverb
subdued	No	Yes	No	No
subduedness	Yes	No	No	No

subdued (noun)	subduedness (noun)
	the property of lights or sounds that lack brilliance or are reduced in intensity
	a disposition to be patient and long suffering

subdued (adjective)	subduedness (adjective)
lacking in light; not bright or harsh
not brilliant or glaring
restrained in style or quality
in a softened tone
quieted and brought under control