A colloquial expression meaning that something or someone does not fit current social norms, is perceived as embarrassing, or does not have a positive, laid-back vibe.
example
Seinen Müll einfach auf die Straße zu werfen, ist echt uncool.
Just throwing your trash onto the street is really uncool.
Usage tips
Word structure
The word is a combination of the German negating prefix 'un-' and the English loanword 'cool.' The meaning is therefore very direct: 'not cool.'
EXAMPLE
Ich fand sein Verhalten auf der Party ziemlich uncool.
I found his behavior at the party pretty uncool.
Register: colloquial speech
'Uncool' is a colloquial word and is used mainly in informal conversations. It should be avoided in formal texts or situations.
EXAMPLE
Sorry, aber jemanden zu unterbrechen, ist echt uncool.
Sorry, but interrupting someone is really uncool.
Typical use
'Uncool' is very often used in sentences with 'sein' (to be) or 'finden' (to find/consider). For example, you say that a behavior 'uncool ist' (is uncool) or that you 'etwas uncool findet' (find something uncool).
EXAMPLE
Ich finde es uncool, wenn man nicht zu seiner Meinung steht.
I think it's uncool when people don't stand by their opinion.
Compare with
antonym
uncool vs cool
cool
'cool' and 'uncool' are opposites in colloquial language. You say 'cool' when something seems good, modern, impressive, or laid-back. You say 'uncool' when something seems embarrassing, inappropriate, or not laid-back. Both words are especially suited to casual conversations, for example among friends. The important point is: 'uncool' does not simply mean 'bad', but often means that something does not come across well socially.
uncool
Findest du es uncool, wenn ich mit meinen Eltern zur Party komme?
Do you think it's uncool if I come to the party with my parents?
cool
Im kleinen Laden um die Ecke gibt es richtig coole Taschen.
The little shop around the corner has really cool bags.