IPA: /nɒnˈmæθəmætɪkəl/
KK: /nɑnˈmæθəmætɪkəl/
Not related to mathematics or mathematical concepts.
The nonmathematical approach to the problem allowed for more creative solutions.
Nonmathematical → It is formed from "non-" (meaning not) and "mathematical" (from Greek "mathematikos", meaning of learning or relating to mathematics). The word "nonmathematical" means not relating to mathematics or mathematical concepts.
Think of 'non-' meaning 'not' and 'mathematical' relating to 'mathematics' — so nonmathematical describes something that is not related to mathematics.