uncool
Definitions
Lacking style, fashionability, or social appeal.
Failing to conform to current trends or social norms.
Unpleasant, disagreeable, or socially unacceptable.
Examples
It is considered uncool to show up late to a party without an invitation.
He felt incredibly uncool wearing a suit to such a casual backyard barbecue.
Making fun of someone for their interests is just plain uncool.