deadpan, expressionless, impassive, poker-faced, unexpressive
Meaning: deliberately impassive in manner; "deadpan humor"; "his face remained expressionless as the verdict was read"
Meaning: having or revealing little emotion or sensibility; not easily aroused or excited; "her impassive remoteness"; "he remained impassive, showing neither interest in nor concern for our plight"- Nordhoff & Hall; "a silent stolid creature who took it all as a matter of course"-Virginia Woolf; "her face showed nothing but stolid indifference"
He went to the window and turned to look again at the impassive figure on the bed.
"Madame, he is--" cried Brigitte, thinking that her mistress was alone. At the sight of the public prosecutor, the old servant's joy-flushed countenance became haggard and impassive.
In vain did he try to fortify himself by a thousand heartless examples of men of fashion, and to chill the glow of generous sentiment with that cold derisive levity with which he had heard them talk of female virtue: whenever he came into her presence she was still surrounded by that mysterious but impassive charm of virgin purity in whose hallowed sphere no guilty thought can live.