impassive vs poker-faced

impassive and poker-faced both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impassive	No	Yes	No	No
poker-faced	No	Yes	No	No

As adjectives, impassive and poker-faced are synonyms defined as:

Other synonyms of impassive include deadpan, expressionless, unexpressive.

impassive (adjective)	poker-faced (adjective)
deliberately impassive in manner	deliberately impassive in manner
having or revealing little emotion or sensibility; not easily aroused or excited