impassive russian

• бесстра́стный

  impassive, passionless

• безэмоциона́льный

  emotionless; impassive

  unemotional; lacking emotion

• ка́менно

  stonily, motionlessly, impassively, like stone

• бесстра́стно

  impassively, dispassionately, unfeelingly, coldly