simplicity vs simple mindedness

simplicity and simple mindedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
simplicity	Yes	No	No	No
simple mindedness	Yes	No	No	No

As nouns, simplicity and simple mindedness are synonyms defined as:

Other synonyms of simplicity include simpleness.

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