uncool
adj. B2 Upper Intermediate US //ˌənˈkuɫ// UK //ʌnkˈuːl// un·cool
adj. not cool or not stylish. You use this to describe something that is boring, unfashionable, or not popular with your friends.
adj. lacking in style, popularity, or social appeal. Informal in register; typically used to describe actions, objects, or behaviors that fail to meet current social standards of desirability.
Wearing that ugly hat to the party is totally uncool.
It was pretty uncool of him to ignore his best friend when they were walking down the street.
The marketing campaign was criticized as uncool by younger demographics, who found the nostalgic references to 1980s technology to be outdated and inauthentic.
From un- + cool.