impassivity vs unemotionality

impassivity and unemotionality both are nouns.

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

As nouns, impassivity and unemotionality are synonyms defined as:

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

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

impassivity (noun)	unemotionality (noun)
apathy demonstrated by an absence of emotional reactions	absence of emotion
	apathy demonstrated by an absence of emotional reactions