impassivity vs stolidity

impassivity and stolidity both are nouns.

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

As nouns, impassivity and stolidity are synonyms defined as:

impassivity and stolidity: apathy demonstrated by an absence of emotional reactions

Other synonyms of impassivity include emotionlessness, impassiveness, indifference, phlegm, unemotionality.

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