impassive
Concise Oxford English Dictionary © 2008 Oxford University Press:
impassive/ɪmˈpasɪv/
▶adjective not feeling or showing emotion.
– derivatives
impassively adverb,
impassiveness noun,
impassivity noun.
impassively adverb,
impassiveness noun,
impassivity noun.
'impassive' also found in these Oxford entries:

