Out of her presence what I had seen was unthinkable, unbelievable.
It must tend to some end, or else our universe is ruled by chance, which is unthinkable.
They are unthinkable and only to be approached by the statistician or the poet.
Worn as he was, it was unthinkable that he should go far to-night.
At best, it was void of honor; at worst, it was unthinkable.