impassive
1. [ adjective ] having or revealing little emotion or sensibility; not easily aroused or excited
Synonyms: stolid
Examples:

"her impassive remoteness" "he remained impassive, showing neither interest in nor concern for our plight"- Nordhoff & Hall "her face showed stolid indifference"

Related terms: unemotional
2. [ adjective ] deliberately impassive in manner
Synonyms: expressionless poker-faced unexpressive deadpan
Examples:

"deadpan humor" "his face remained expressionless as the verdict was read"

Related terms: uncommunicative
Similar spelling:   impassively
  impasse
  impassivity
  impassioned
  impassable
  impossible
  impasto