simplicity vs simple-minded

simplicity is a noun but simple-minded is not a noun.

Word	Noun	Adjective	Verb	Adverb
simplicity	Yes	No	No	No
simple-minded	No	Yes	No	No

simplicity (noun)	simple-minded (noun)
freedom from difficulty or hardship or effort
lack of ornamentation
the quality of being simple or uncompounded
absence of affectation or pretense
a lack of penetration or subtlety

simplicity (adjective)	simple-minded (adjective)
	lacking subtlety and insight
	lacking mental capacity and subtlety