IPA: //ʌnˈtrɛndi//
KK: /ʌnˈtrɛndi/
Not fashionable or popular at the moment; out of style.
Wearing those shoes is considered untrendy these days.
Untrendy → It is formed from "un-" (meaning not) and "trendy" (from the word "trend", which comes from Old English "trend", meaning to turn or revolve). The word "untrendy" means not in style or not fashionable.
Think of 'not' ('un-') being added to 'trendy', which means something that is currently in style. This helps you remember that 'untrendy' refers to something that is not fashionable.