Unfashionably Late Edit Meaning

1.

Derived from fashionably late.

To be unfashionably late is to have missed, and gone over the time period (between 5-15 minutes) where you are fashionably late. While being fashionably late is recognized by the host(s), being unfashionably late makes you seem rude.

"Tom was unfashionably late for my party, what a dick"

See fashionably late, late, on time, rude