Deliberately impassive or expressionless.
Impassive.
Having such a face or look.
In a deadpan manner.
To express (oneself) in an impassive or expressionless manner.
A style of comedic delivery in which something humorous is said or done while not exhibiting a change in emotion or facial expression.
unfriendly
not congenial or compatible
not desiring the company of others
A person who is not sociable.