inexplicable

adj

1. Impossible to explain; not easily accounted for.

   “The year 1866 was signalised by a remarkable incident, a mysterious and inexplicable phenomenon, which doubtless no one has yet forgotten.”

   ““No,” replied the girl, “it would not be strange, of course; but for some inexplicable reason I have one of those foolish feminine presentiments that all is not right with Mr. Caldwell. It is the strangest feeling—it is as though I knew that he was not on board the ship.””

noun

1. Something that is impossible to explain.

   “HEE [Cleanthes] left behind him (ſaith [Diogenes] Laertius) theſe excellent Books. […] Of Inexplicables.”

   “The premature passing of Bob Collins and the sadness it begets leave us in wonder. A man of vigor and vitality, compassion and concern, and a joyous contributor enhancing each new day is suddenly no more. Or is that also conjecture or gospel? Could it be that his departure is but a chapter in the imponderable mystery we long to comprehend? An inexplicable that cannot be perceived?”

   “Each clone acts as a huge, undivided tree, with its own time of flushing spring leaves, of turning yellow, and its own shade of yellow that can vary from lemon to salmon to an occasional sandy red, the color change defining the margins of each clone. The contrasting colors depend on variations in soil chemistry, slope exposure, genetic makeup, and a grab bag of inexplicables that bless trees, growing so closely that their upper branches may touch, with smartly different colors.”

   “Her proposition was that at the heart of each of the great tragedies were unanswerable questions about love, and, to make sense of the plays, we must each attempt to explicate these inexplicables in our own way.”