unmathematicaladj.

1672 J. Eachard Mr. Hobbs's State Nature Considered 50 Do you, Tim, approve of this illogical, unphilosophical, and unmathematical way of writing?

a1679 R. Boyle Mr. Anthony (1690) 28 Lord! What an Un-mathemattical Head you have: How a duce can I choose if you choose first.

1720 M. Prior Let. in Q. Rev. Jan. (1913) 115 All the cross unmathematical devils upon earth first put it together.

1784 R. Bage Barham Downs I. 230 One unmathematical passion however, Avarice,..had got fast hold of me.

a1845 S. Smith Elem. Sketches Moral Philos. (1850) 395 Any immoral, irreligious or unmathematical track of thought.

1921 National Geogr. Mag. Jan. 1/2 There were the little matters of cramming into a chronically unmathematical head sufficient knowledge of navigation to steer such a ship across the world.

1995 C. D. Short Shining Shining Path xxi. 318 For the second time that day, James Crowe did something highly unmathematical. He crossed his fingers. Both hands.

2009 Guardian (Nexis) 11 Aug. 29 The current emphasis on China and India's carbon emissions is not only unmathematical but also smacks unpleasantly of finding an excuse to restrict the growth of any country likely to become an economic rival to us.