IPA: /ʌnˈfæʃənəbli/
KK: /ʌnˈfæʃənəbli/
In a way that is not in style or not popular at the moment.
She dressed unfashionably, wearing clothes that were out of date.
**Unfashionably** → It is formed from "un-" (meaning not) and "fashion" (from Old French *façon*, meaning manner or style) and "-ably" (meaning in a manner). The word "unfashionably" means in a manner that is not in style or out of fashion.
Think of 'not' ('un-') being combined with 'style' ('fashion') to remember that 'unfashionably' means not in style.