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Adjective: stony-faced  'stow-nee,feyst
Usage: informal
  1. Showing no emotion; having a blank or expressionless face
    "The stony-faced guards stood motionless at their posts";
    - deadpan, expressionless, impassive, poker-faced, unexpressive, straight-faced, stone-faced [informal]

See also: incommunicative, uncommunicative