impassivity vs emotionlessness

impassivity and emotionlessness both are nouns.

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

As nouns, impassivity and emotionlessness are synonyms defined as:

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

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

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