indescribable

adj

1. Impossible (or very difficult) to describe.

   “He proved it with indescribable mathematics.”

   “The beauty and brilliancy of this insect are indescribable, and none but a naturalist can understand the intense excitement I experienced when I at length captured it.”

   “Presently the men set up the melancholy little chant that I had heard on the first night when we were captured in the whaleboat, and the effect produced by their voices was very curious, and quite indescribable.”

   “But there was also about him an indescribable air which no mechanic could have acquired in the practice of his handicraft however dishonestly exercised: [...] the air of moral nihilism common to keepers of gambling hells and disorderly houses; [...]”

2. Exceeding all description.

   “Our hotel had an indescribable view of the Bay of Naples.”

   “The time was when, had such an idea entered her mind, it would have been torture indescribable and agony the most intense; but then, subdued as was the usual warmth of her temperament, an awful suspension seemed to hold her feelings in control.”