mindlessness vs vacuity

mindlessness and vacuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
mindlessness	Yes	No	No	No
vacuity	Yes	No	No	No

As nouns, mindlessness and vacuity are synonyms defined as:

Other synonyms of mindlessness include inanity, pointlessness, senselessness.

mindlessness (noun)	vacuity (noun)
the trait of acting rashly and without prudence	total lack of meaning or ideas
total lack of meaning or ideas	a region that is devoid of matter
	the absence of matter