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Adjective: uncommunicative  ,ún-ku'myoo-nu,key-tiv [N. Amer], ,ún-ku'myoo-ni-ku-tiv [Brit]
  1. Not inclined to talk or give information or express opinions
    "The uncommunicative cell phone company lost my business";
    - incommunicative

See also: close, closelipped, closemouthed, deadpan, expressionless, impassive, inarticulate, incommunicado, inexpressive, mum, out of touch, poker-faced, secretive, silent, straight-faced, taciturn, tightlipped, unarticulate, unexpressive, unpronounceable, unutterable