impassive, stolid -- (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")
deadpan, expressionless, impassive, poker-faced, unexpressive -- (deliberately impassive in manner; "deadpan humor"; "his face remained expressionless as the verdict was read")
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