IPA: //ʌntrəˈdɪʃənl//
KK: /ʌntrəˈdɪʃənl/
Not following established customs or practices; different from what is usually done.
Her untraditional approach to cooking surprised everyone at the dinner party.
Untraditional → It is formed from "un-" (meaning not) and "traditional" (from Latin "traditio", meaning to hand over or deliver). The word "untraditional" means not adhering to traditional practices or customs.
Think of 'not' ('un-') following the ways of 'handing over' ('traditio') — that's why untraditional means not following traditional ways.