IPA: /nɒnˌɛnˈzaɪmətɪk/
KK: /nɑnˌɛnˈzaɪmətɪk/
Not related to or involving enzymes, which are proteins that speed up chemical reactions in living organisms.
The reaction occurred through a nonenzymatic process, meaning it did not require any enzymes to take place.
Nonenzymatic → It is formed from "non-" (meaning not) and "enzymatic" (from Greek "enzymon", meaning leaven or ferment). The word "nonenzymatic" refers to processes or reactions that do not involve enzymes.
Think of 'non-' meaning not, and 'enzymatic' relating to enzymes — so nonenzymatic means not involving enzymes.