stolidness vs stolidity

stolidness and stolidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
stolidness	Yes	No	No	No
stolidity	Yes	No	No	No

As nouns, stolidness and stolidity are synonyms defined as:

Other synonyms of stolidness include stoicism.

stolidness (noun)	stolidity (noun)
an indifference to pleasure or pain	an indifference to pleasure or pain
	apathy demonstrated by an absence of emotional reactions