passivity vs passiveness

passivity and passiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
passivity	Yes	No	No	No
passiveness	Yes	No	No	No

As nouns, passivity and passiveness are synonyms defined as:

passivity and passiveness: the trait of remaining inactive; a lack of initiative

As nouns, passivity and passiveness are synonyms defined as:

passivity and passiveness: submission to others or to outside influences

passivity (noun)	passiveness (noun)
the trait of remaining inactive; a lack of initiative	the trait of remaining inactive; a lack of initiative
submission to others or to outside influences	submission to others or to outside influences