Definition of "incogitancy"

'Tis folly and incogitancy to argue anything, one way or the other, from the designs of a sort of beings with whom we so little communicate.

1681, Joseph Glanvill, Saducismus Triumphatus

The motion of my blood no longer keeps time with the tumult of the world. It leads me to seek for happiness in the lap and love of my family, in the society of my neighbors & my books, in the wholesome occupations of my farm & my affairs, in an interest or affection in every bud that opens, in every breath that blows around me, in an entire freedom of rest or motion, of thought or incogitancy, owing account to myself alone of my hours & actions.

1793 June 9, Thomas Jefferson, letter to James Madison