incogitancy
A lack of thought or thinking.
countable, uncountable
'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.
Where it comes from
From Latin incōgitantia (“thoughtlessness”), from incōgitāns, from in- + cogitāns, present active participle of cōgitō (“think”).
Adapted from the Wiktionary entry incogitancy (CC BY-SA 4.0).