from late Latin incōgitābilis thoughtless, inconceivable
1522 - A Treatyse uppon these Wordes of Holye Scripture Memorare Novissima etc.
( = De Quatuor Novissimis), Sir Thomas More;
see below from E-NED
From: Prolegomena to Every Future Metaphysic,
Which Can Appear as a Science
From the German of Emmanuel Kant
By John Richardson, 1819