Definition of "incoherency"

[…] Haste and Sickness made me rather venture on your good Nature, for the Pardon of a venial Fault, than put myself to the trouble of altering the Order of these Papers, and substituting new Transitions and Connections, in the room of those, with which I formerly made up the Chasms and Incoherency of the Tract, you now receive.

1686, Robert Boyle, A Free Enquiry into the Vulgarly Receiv’d Notion of Nature‎, London: John Taylor, Conclusion, page 409

Pardon, madam, the haste and incoherency of scrawls penned at so trying a moment.

1785, Sophia Lee, The Recess‎, London: T. Cadell, Volume 3, Part 6, p. 260

“It can make no change. You do not understand my position,” returned the doctor, with a certain incoherency of manner.

1886 January 5, Robert Louis Stevenson, Strange Case of Dr Jekyll and Mr Hyde, London: Longmans, Green, and Co.

[…] that which would best of all justifie me, and the seeming incoherencies of some parts of my Discourse, would be the noble Authors Piece it self […]

1667, John Evelyn, “To the Reader”, in Publick Employment and an Active Life Prefer’d to Solitude‎, London: H. Herringman

For besides the unavoidable incoherencies, which must be reconciled and adjusted; one may safely affirm, that all popular theology, especially the scholastic, has a kind of appetite for absurdity and contradiction.

1757, David Hume, “The Natural History of Religion,” section 11, in Four Dissertations, London: A. Millar, p. 70

[…] he took into his large moist palm the dry little hand of his friend, while they both broke out into the incoherencies of people meeting after a long time.

1887, William Dean Howells, chapter 1, in April Hopes‎, New York: Harper, page 3