\In*cog"i*tance\, Incogitancy \In*cog"i*tan*cy\, n.
[L. incogitantia.]
Want of thought, or of the power of thinking;
thoughtlessness; unreasonableness.

      'T is 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.           --Glanvill.