inconceivableness

/ˌɪnkənˌsivəbəlnəs/
noun
  1. The quality or state of being impossible to imagine or understand.
    • The inconceivableness of the tragedy left the community in stunned silence.
    • She tried to explain the inconceivableness of time travel to her younger brother.
    • The inconceivableness of the universe's size humbles even the most brilliant astronomers.
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