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Adjective: unthinkable  ,ún'thing-ku-bul
  1. Incapable of being conceived or considered
    "From earthquakes to hurricanes, tidal waves to terrorist attacks, the unthinkable usually remains the unmentionable"

See also: impossible, inconceivable, incredible, out of the question, unbelievable, unimaginable

Antonym: thinkable

Encyclopedia: Unthinkable