Definition of "incomprehensible"

But this inference, which is supported by the opening of Book I, renders incomprehensible the note "and I have finished writing this," which is included within the dream.

1904-09, Mark Twain, Letters from the Earth, published 1962

In the empty immensity of earth, sky, and water, there she was, incomprehensible, firing into a continent.

1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], part I, page 196

He shook his head. 'It's not only undefined, it's incomprehensible. Even the QL is befuddled by it and can't give me straight answers.'

1990, Greg Bear, Heads