IPA: /nɒnˈstaɪl/
KK: /nɑnˈstaɪl/
A lack of style or a way of doing things that does not follow any particular style.
The room was decorated in a nonstyle that made it feel very plain and uninviting.
Nonstyle → It is formed from "non-" (meaning not) and "style" (from Old French *estile*, meaning manner or mode). The word "nonstyle" refers to a lack of style or a manner that is not stylish.
Think of 'not' ('non-') combined with 'manner' ('style') to remember that 'nonstyle' means lacking a particular manner or style.