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Adjective: stone-faced  'stown,feyst
  1. [informal] Showing no emotion; having a blank or expressionless face
    "The defendant remained stone-faced throughout the verdict";
    - deadpan, expressionless, impassive, poker-faced, unexpressive, straight-faced, stony-faced [informal]
     
  2. (of a building) having a facade made of stone
    "The stone-faced cathedral dominated the city skyline"

See also: incommunicative, uncommunicative