mindlessness vs heedlessness

mindlessness and heedlessness both are nouns.

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

As nouns, mindlessness and heedlessness are synonyms defined as:

mindlessness and heedlessness: the trait of acting rashly and without prudence

Other synonyms of mindlessness include rashness.

mindlessness (noun)	heedlessness (noun)
the trait of acting rashly and without prudence	the trait of forgetting or ignoring your responsibilities
total lack of meaning or ideas	the trait of acting rashly and without prudence
	a lack of attentiveness (as to children or helpless people)