impassive

英[ɪm'pæsɪv] 美[ɪm'pæsɪv]

1. 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"

2. deliberately impassive in manner;: "deadpan humor"; "his face remained expressionless as the verdict was read"