Definition & Meaning of "uncool"in English

What does "uncool" mean in social evaluation slang?

The term "uncool" describes something or someone that is socially undesirable, unfashionable, or lacking approval within a group or culture. The structure is a negated form of "cool," which in slang means acceptable, admirable, or socially valued. It is informal and commonly used to dismiss behavior, attitudes, or trends that are seen as awkward, outdated, or not in line with group norms.