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Adjective: impassive  im'pa-siv
  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";
    - stolid
  2. Deliberately impassive in manner
    "impassive humour";
    - deadpan, expressionless, poker-faced, unexpressive, straight-faced

See also: incommunicative, uncommunicative, unemotional

Encyclopedia: Impassive