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incommunicable

incommunicable - adjective

  1. Not speaking freely or openly: close, close-mouthed, incommunicative, reserved, reticent, silent, taciturn, tightlipped, uncommunicable, uncommunicative. See restraint. sounds.
  2. That cannot be described: indefinable, indescribable, ineffable, inexpressible, undescribable, unspeakable, unutterable. See words.