unthinkable: Meaning and Definition of
Pronunciation: (un-thing'ku-bul), [key]
- inconceivable; unimaginable: the unthinkable size of the universe.
- not to be considered; out of the question: Such a suggestion is unthinkable.
- something that cannot be conceived or imagined, as something too unusual, vague, or disagreeable: Today's unthinkables are tomorrow's realities.
- unthinkable (Thesaurus)